Firstly, Bowser is not low tier. He's a tier above Charizard because he is basically Charizard but kills 40% earlier on average. Charizard's superior mobility doesn't count for much against top tiers because all of them except Rosa and maybe Villager are mre mobile than him. Spacing and burst options matter more when you're slower, and Bowser has better tools for that. Charizard technically has more landing mix-ups, but Bowser still has an answer for every option, with much higher reward (you can realistically kill off picking the correct landing option). His landing options also don't all lose to shield like Charizard's.
Secondly, of all those characters, Bowser is the only one who can kill you pre 100 with an option that is less that 15 frames. The other characters would not only need a hard read, but would need the opponent to commit to something laggy enough to be punished by a slow attack that can kill early. Most top tiers simply don't need to select those options against slower characters.
I said "lower spectrum in the game". That doesn't mean "low-tier". That's anywhere from mid-tier to bottom. In contrast, someone like Mario is in the higher end of the spectrum; anywhere from mid-tier to top-tier. Basically, halves. Why? 'Cause it's annoying to say who's in what tier and getting bombarded by "yeas" and "nays" to that... Which still happened.
When you all were talking about how tier lists should have been set up. I wanted to bring up an idea of "has" and "has nots". The people in "has" are like 15 characters and 15 characters we could "easily" agree on while the 40 other characters are "has nots". The 40 "has nots" would be allowed to migrate to "has" as would the people in "has" migrate to "has nots". So, say Peach starts to do well and starts securing fantastic results, national and international. If acknowledged, she would move into "has" just like Wario, Meta Knight, Ryu - blame DLC since if he was in the game at launch, it would have been clear he was a good character -, and Ike. Now, someone like Greninja while doing well, still hasn't dominated like Ike and Meta Knight has. He's still in "has not" despite doing well like the Pits, Bowser Jr., Toon Link, Pac-Man, and currently, Peach. This is going to be an unpopular idea, yes?
For those who just glance at it, they could misinterpret this as just a top and bottom tier list which would be really bad when top tier consists of ~15 characters while bottom has ~40. It'd be more fuel for anti-Smash 4 stuff and character fights. The reason for this idea is that we really don't know where the other 40 or so characters are. You can claim DK is high tier, but can you claim that Little Mac is even mid, Marth even high, or Samus even low? It's a muddied mess that people either don't really care about or actually get migraines figuring out if, for example, Palutena is mid-, low-mid, or bottom with all arguments against and for her. The other reason? Start big and get small. Starting with a big picture where we know a select few are top and high tier and everyone else is somewhere is better than trying to fine tune everything right from the beginning. When someone draws, usually, they don't start with the finest detail like the eyes and then everything else. Doing that could make everything out of proportion and out of focus. Do we really need to know right now that Meta Knight is the, hypothetically, 12th best character? No, but we do know he's somewhere in top 15 or top 20 at the least. And we definitely don't need to know that Little Mac is the, hypothetically, 37th best character. I mean, who the hell cares if he's the 37th best character? It might be better to know that Little Mac's somewhere in mid-low than to argue in places and that he's exactly in this tier, numbered this, and these 55 other characters are exactly here and numbered whatever. That's an insane amount of work to do on a game we barely know. Melee, Street Fighter II, Super Mario 64., you name it are old games, but people are still figuring out things and if they have figured out "everything", it took them years. The internet no matter how easy it is to share information, can't drastically accelerate this process when basic concepts are still being ironed out. You can't suddenly make pot-au-feu without knowing how to make a simple soup, cut vegetables, meat, etc.
Now for something entirely different: I just noticed that since Falco, Little Mac, Mega Man, and Roy all have the same fall speed, they're all susceptible to Ryu's... Ryu stuff. Of the 4, Falco, Little Mac, and Roy have the worst disadvantages - they don't exactly have good recoveries, good get out here options, good combo breakers, and can't really endure much damage - and they can't exactly play mid-range as well as Ryu or... Mega Man who's probably the only one to actually not have to deal with Ryu and his own fast fall speed screwing him over when he doesn't have to play up close like the other 3. All of them have good to high walk speeds and good pokes, so they can play footsies with Ryu, but Mega Man's ranged, so he doesn't really need to worry about getting into Ryu's zone. Here's a question: was this (unintentionally) bad game design? You have 4 characters with the same fall speed, 2 who have the same weight, and 3 who suffer from bad disadvantages while having average to low weight. Mega Man's mostly exempt from this, but the other 3? Especially factoring in that Roy needs to get in to do enough damage and knockback for kills, could it be possible to say that Falco, Little Mac, and Roy are the "same" MU for Ryu. Everything Ryu needs to do to Roy, he can do to Falco and Little Mac. The play style Ryu needs to play with Falco is the "same" with Roy and Little Mac. These 3 also cannot make mistakes at all compared to Mega Man who "can't" make mistakes if he's out there playing at a safer range while the other 3 prefer playing up-close... in Ryu's range. I ask this because while watching a Little Mac vs. Ryu on terminalkai, a wire connected: "Wait... Little Mac has the same fall speed as Falco... and so does Roy! and Mega Man too!" I also ask this since... really, of all the freaking attributes in the game, fall speed has 1.8 shared by 4 characters who all have kind of bad disadvantages. And then you look at the 4 characters with a fall speed of 1.65; can you really say that Bowser Jr., Duck Hunt, Ike, and Ganondorf all have bad disadvantages to the point where 2 of them because of shared weight, pretty much can die to the same setups at the same time? Sure, Falco's gravity, 0.13 is higher than Little Mac's by 0.05, but is that enough? Just a little (, silly, wild) question for people to
ignore ponder.