They wanted to buff Jigglypuff.
I know this was in jest, but Jigglypuff really likes low platforms moreso than high ones. She doesn't go very high with just one jump, but she has the movement to really maneuver around low platforms better than most. High platforms are something I'd favor more with Wario if I wanted an aerial mobility focused character though I'm also quite a fan with a lot of different characters (Rosalina loves high platforms, and IMO DK does too).
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The idea that we somehow don't want lots of stages on with big money on the line, to go back about a page, makes zero sense to me. Like if you challenged me to a $1 million money match in Brawl no matter who you are and I somehow had to accept but got to pick the stage I'd always pick Norfair. Why? Well, it's the non-broken stage most to G&W's favor in Brawl across match-ups (Green Greens is better in some, but going GGs is a huge risk if you turn out to be a Snake main while Norfair is always good), and I know the stage well. I know the fire hazards are zero threat to me since I actually know how to play Norfair so the only randomness they add really is if my opponent is bad at Norfair then the stage might randomly help me by having the angry fire gods do something they don't know how to handle but it will never randomly hurt me because I know what to do. I also know the stage has a mountain of individual stage knowledge nuance, and I know just about all of it (in my big-headed opinion). The thought that with money on the line that I'd instead prefer to play on a stage like Smashville and set so much of my skill and knowledge aside, stuff I have as a player that could make me win, just seems insane. It's basically saying that with money on the line it is preferred to give up an avenue by which I can prove myself the better player; why would I ever want that?
Norfair is an extreme stage that I use as an example just because it's so extreme. The geography is unconventional, and the fire everywhere does actually exist. Norfair is a great stage for the super prepared, but I can see how a lot of people would find it challenging. But a stage like Skyloft? I'd honestly be embarassed to show up to any tournament for smash wii u not fully prepared to play on a stage like that. You have to learn dynamics for less than 10 landing sites (I dunno how many it actually has but I'm pretty sure less than 10) and how to play on a stage with a pass-through floor and some different platform lay-outs. It's not only really easy to figure out how to play competently on the stage but every different area gives a different ability to show knowledge and skill in a unique way. Honestly the more money is on the line the more I want to play on a stage like this that lets me show as much of my skill as possible. After all, the worst outcome is to lose a game to an opponent I am generally better than, and I have this fear that's a lot more likely on a static stage that lets them know only one good attack pattern or method of stage control better than I as opposed to a stage like Skyloft in which they have to outplay me in a diversity of environments to win.
As per who wants it, I don't have it on-hand, but I know Overswarm has done considerable study on this topic with competitors in his area and found, decisively and conclusively, that interest in Brawl tournaments dropped as stages got banned. It certainly matches my experience locally as well. A few players who are laser focused on playing well on a tiny handful of stages probably prefer only a tiny handful be legal, but the tournament going masses definitely want more. They aren't all out crazy liberal (they might not agree to my beloved Norfair), but they very much and very strongly do want stages like Skyloft. I'd go so far as to say, with confidence, that events will get higher turnout by including these stages.
As per spectators, it's the same thing really. It's easy to say (with no evidence) that these stages make games take longer and that spectators don't want that, but think about it from a spectator's shoes. A tournament stream could run all day; who cares if one set takes 5 mintues or 30 minutes? What gets boring and you do hear spectators complain about all the time is a lack of variety. They hate seeing the same characters and same stages all the time; they want to see people do different stuff so over the time watching the stream they can see more different things and it will be more interesting. Not only is more stages immediately filling one of those needs, but I'm pretty strongly convinced that smash games have more character diversity with more (reasonable) stage diversity so you fill that need too. That was definitely true in Brawl: ban stages, see fewer characters. People made up this fairy tale that you had to ban every stage to hold MK back, but MK did about the same on every stage list and all you were really doing was giving the share of the market that used to belong to characters like G&W, Pikachu, and Wario to characters like Diddy Kong, Olimar, and Ice Climbers. So we'll have to see for sure how things play out in smash wii u, but I'd say the safest starting bet is to have a lot of legal stages if our goal is to make the stream happy.
Honestly, I feel like all those kinds of reasons are compelling, but the stage rules stuff bothers me on a deeper level. I've been smashing for a long time, and when I was really getting into it, everyone always said "no johns" to everything. Win or lose don't complain or blame the game. So much of what I hear about banning stages (and honestly other stuff like some of the anti-custom move posts) are basically just johns, so many johns about stuff like Halberd's hazards that aren't even complaints about theoretical merit but just complaining about having to deal with something. I've played a lot of tournament games on Halberd over the years in Brawl. I've won quite a few but lost some too. In every game I lost, I lost because my opponent played better than I played and deserved to win. That's it; no johns.
I actually worry we're teaching newer and younger playes that the johning mindset is the one to use, and it takes me back to one of my earlier Brawl tournaments. The tournament in question had one stage ban, and I decided I was always going to use mine on Final Destination since I knew it was a pretty bad G&W stage that people liked to pick against G&W. The thing is that Luigi's Mansion was legal and was widely believed to be a super horrible G&W stage; I wasn't convinced of all that but knew it wasn't great for him and wasn't one I was going to be picking. I was, however, prepared enough for the tournament and familiar on a basic level with the stage's mechanics and how my character could move around it. I had to play a pretty decent local Olimar who was quite convinced I had to ban Luigi's Mansion so he could pick FD. I didn't comply and banned FD so he decided he was going to teach me the error of my ways on Luigi's Mansion. I didn't know that Olimar's up smash was a combo into itself under the ceiling there (apparently further you can tech out of it if you're really good, but I certainly didn't know that!), and I found out hard the first stock as I took something like 80% the first time I got hit. It surprised me a lot, but I did survive and backed off. I assessed the situation and what just happened to me, and I realized this novel new combo required the ceiling. I moved to the edges of the stage and to the upper floors and used my disjointed range to poke at him if he tried to chase or if he moved too close to the edges of the under the ceiling area. When he started camping the middle of it hard (he was winning!), I destroyed the mansion in strategic ways to open new attacking avenues. Slowly I clawed back that 80% with smart and patient play, I didn't get hit by that stupid combo again, and I won the game very narrowly (and he was really salty as an added bonus!). I didn't get upset that something super stupid and unexpected had happened to me on this janky stage; I kept my cool, tried to learn from what had happened, and went on to win the game and the set. This new attitude with so much johning about stages I feel is toxic to that; so many people now would be in that situation, get hit by the stupid combo, and would just let themselves lose. They'd just get mad, keep running into that danger zone, lose another 80% to the stupid combo, and then would just blame the game and stage for their loss. I kinda think the community is better when it's not that way?
Sorry this post got super long, but I just so very strongly disagree that banning most of the stages makes any kind of sense for a lot of reasons. I know there's some serious preaching to the choir on this point to a lot of people who post a lot in this topic, but I think the people this is directed at know who they are and I hope, very desperately hope, will give it some mind. We need diversity; everything is just worse if we don't go for it. This is what drives me here, and IMO this is the mindset we need to have when evaluating Wii U stages.