Less landing lag
Ok, one of the changes in this game is a general increase in landing lag, I'm completely fine with the increased lag when you do an air dodge, I think that's a great way of stopping people from spamming it so much.
But the increased landing lag when you do an aerial attack is something that again limits movement options, because it keeps you stuck on the ground unable to do anything for longer it ruins your ability to followup an attack with another to have some form of combo game, some people say "well that just increases the effectiveness of ground based approaches right? It stops people from spamming aerials too because they're not safe anymore, how is that bad?"
At a very basic level I could see why someone might think this, but 95% of the characters are based around an aerial game and you don't increase the effectiveness of ground-based characters by nerfing everyone elses aerial game, you do it by improving the ground game of those characters (stuff like super armour on moves to stop them being knocked into thee air as much is what helps, see P:M bowser).
There are quite a few people then that have been asking for some form of Lag-cancelling (the official term is soft landing), this is where, in melee and 64, you press a button several frames before you land to decrease the amount of landing frames, what this does is increase the viability of offensive approaches rather than giving all the advantage to the person on defense.
Me? I hate L-Cancelling, there is no reason whatsoever to not lag cancel your move and it's an annoying input to time, especially for people like me with slow reactions and bad muscle memory.
So what a lot of people have proposed is to just reduce lag off of aerials in general, you feel less stuck to ground unable to do anything for long periods of time but I generally want something different that would improve the combo game but also give more opportunities for a punish game.
A good balance would be to make moves have less landing lag if you connect with either a player or a shield, but if you miss the attack because the other player dodges, then you get the increased lag that can lead to a punish, aerial characters get to keep their combo game but they still have risk if they just constantly try to short hop aerial you all the time.