SideB armor comes out quicker than his other grounded red armored moves, no? SideB armor is also equivalent to FSmash armor in endurance. It is pretty ridiculous, but not quite over the top when factoring in what Bowser can/cannot do. Plus you can still get grabbed out of it easily enough and even hit out of it because there ARE small open windows during Klaw. Could be why some higher-level Bowser's choose not to use it often. That or the armor, while fast, doesn't come out fast enough to be a safe choice at that moment. On paper, it's still one of his best moves. Removing this would have to significantly make up for it somewhere else though. Where else? You tell me.
Being able to fast fall aerial Klaw could help in follow-up consistency on stages with multiple/dynamic platforms by giving you a better chance of landing on the ground to at least gain your jump/superjump back. It would probably just net a small situational option at most, though Bowser's moveset tends to be situational anyway ::more talk about this below::
I was gonna even suggest improving Bowser's shield specifically so that he may PowerShield better, but judging from
The NZA's post on reddit and people's opinions on it, this may or may not not be favorable.
I would like to see better shield pressure come from Bowser, honestly. Yes, he does high shield damage already, but it's not quite proper pressure when he has to be so meticulous about when to attack, most of his attacks aren't multi-hit, he can only land a handful of hits (if at that) before your opponent reacts accordingly, and he tends to rely on his shield more so than most of the other characters because they're usually pressuring him harder. I could see Flame Breath being reworked to help aid this, even if this calls for a general shield damage reduction for his moveset. Another multi-hit move could be cool too.
One thing we could be looking closer into as far as Bowser's movement and neutral game goes is not so much speed and jumpsquats n stuff, but how his moveset physically moves Bowser around the stage. What I mean by this is that Bowser's design, no matter what moves he chooses to use (aside from Down/UpB, maybe SideB and Fsmash, which all have significant risks), keeps him planted in that one area without any shift in positioning. Not every character has moves that directly help with movement as their main purpose, but some moves(such as tilts, smashes, or specials) give the character some sort of positional change that they may be able to use to their advantage as they're using them in their primarily intended ways(lucario's ftilt, Spacie's/Links's fsmash, Jigglypuff's SideB, etc). Those that don't have such moves tend to not really need them anyway. Bowser kinda doesn't fit in either of those two camps.
I'll use a specific example: Ganon isn't an example of great movement and movement options just like Bowser, but the SideB that Ganon has does help with his neutral game better than Bowser's SideB, or even SuperJump, does for Bowser because Ganon dashes straight at you from a great distance. Due to this horizontal distance, it gives Ganon a way to move around the stage while being a threat IN ONE MOVE. In a moment where Ganon is just shy of landing an A move, his SideB just might make it. On the other hand, If Ganon misses, the distance he travels MAY be far enough for the opponent to not be able to punish, and may even give Ganon another shot to punish the opponent. That and it's also a recovery move. Then there's Ganon's DownB. This move also gives Ganon an extended dash while being a threat which can cover a good deal of options, but it doesn't stop there. If done in the air, the trajectory changes to a much more vertical dash, giving him yet another positional option from a single move. According to
this video, grounded DownB's landing animation can easily change from grounded to aerial. This gives Ganon YET ANOTHER POSITIONAL OPTION AND A NEW WAY TO APPROACH from one move.
I believe that little details and intricacies such as these should make for more personal and unique style of Bowser gameplay that we may be looking for. I mean, if we want Bowser to have more colorful and flexible styles for players to form, but don't want him to be a faster (possibly smaller?), 'wavedashable' offensive character (though i'm not against this), nor do we want to give him funny unnatural properties to add to his 'gimmicks' and 'immovable object' gameplay, then i'm not sure where else you could go other than giving his moveset some inherently creative movement. Maybe then Bowser could actually find a way to play safer and more effectively without radically changing him.