I disagree with the term "perfectly level" playing fields of course, because character attributes inherently turn stages into uneven grounds of play.
Personally, I like the variety that the stages offer. When we set precedents for banning and removing levels that aren't ostensibly "fair," then that means people will keep banning things with "stupid" elements, steadily eliminating more and more variety and fun from the game. I hate using the slippery slope argument but that's what happens. Once you set a precedent for "ban this," people start saying "well why not ban this? They're very similar."
People want to remove Fountain from the starter list, as it isn't fair to certain characters. That sucks for ME because quite frankly it's my favorite level and my go-to counterpick, regardless of the character I'm fighting! But the platforms can interfere with people's linear shuffle games, and rather than pay attention to them they'd rather just not play there.
People want to get rid of Battlefield because the edge is "dumb." Let's take Yoshi's off because Randall interferes with recovery and you can't *really* control when people get sent off the stage, even though you can adapt by checking the timer periodically. Oh, and the Fly Guys mess with hitboxes and stuff, so that level is just crap-tier for Ness. But nobody really mentions Ness.
Dreamland? Huge stage, promotes camping, Wispy ruins everything, and we're already facing a Jiggs-centric meta-game for our top 1 and 2, and this is one of her best stages. Pokemon? Transformations make things dumb and it hugely favors characters with horizontal mobility. Leaving us with... FD as the only stage you can't complain about for its inherent characteristics. Except THEN the ability to control match momentum through platforms and stage control becomes removed, and CGs become strong... so yes, I guess you can.
Our stages are all inherently skewed towards particular styles of play. I am of the (apparently pretty lonely) opinion that we should NOT be trying to determine what method of play is "best," keep as many non-broken elements of the game in, and have people develop effective playstyles around the game as is.
Items? Banned for random and extreme localized advantages/disadvantages. Certain levels? Banned for degenerative and broken strategies. Other levels? Because they're different from... certain other levels we chose because we just liked them better. Which we can't even agree on and people want to get rid of some of them. Preference is dictating our meta-game rather than the simple tenet of "if it ain't broke don't ban it."
I have no idea how legitimately broken Fox is or is not on PF because nobody goes there anymore. I have almost no experience in tournament with that level, except for two fun recollections:
--Plank took me there at Super Champ Combo and I switched to Fox (go figure!). Didn't camp but I won.
--Edreese took me there at my debut IC infiniting tournament and I switched to Ganon for surprise counter-counterpicking.
My working knowledge of that stage is pretty limited. I spend a lot of time practicing on Brinstar and Cruise (since those are the most commonly allowed and selected CPs against my character) and I feel like I'm not at any tremendous disadvantage on those levels even though they're SUPPOSED to suck bad for ICs.
Conventional wisdom is "convenient" wisdom, which doesn't mean it's accurate. X is a bad level for Fox... well, maybe certain parts suck. Maybe certain parts are awesome! Mute is crap for ICs in certain respects, but lots of practice has shown me it's *harder* to gimp Nana there for 80% of the level, half of it is a miniature FD with no edges so I get freebie grabs on edgeguards (so that's a stock) and then the mass of platforms lets me poke safely with u-air and smashes. Wide stage sections means I get to zone comfortably without worrying about getting pushed off. Cars hinder everybody so what's the difference there? The REAL problem with Mute is that every stationary segment is slightly sloped, which has fun effects on Nana's AI that most people don't know about. I only learned all this after spending a lot of time in training mode and just a couple matches getting acclimated to the level. Conventional wisdom says "ban or switch if you're ICs," experience tells me it's not so bad.
So what might I find out about Pokefloats if I play on there enough? I dunno, let's ban it first.