Melee doesn't punish you for having a sloppy technical game. I know of tons of people who can do frame-perfect techs and shine tricks but who lose cataclysmically to much less technical players (like, say, me) because they lack hatre... mindgames.
The advanced techniques don't break the game in a manner that it's impossible to win without them. In fact, a lot of elite players don't spam wavedash and other "ATs". What ATs do is add options to your mindgames. They allow you more options to mixup (mindgames), fake-out (mindgames), bait (mindgames), etc., etc., etc., etc.
I mean, what do you think mindgames are? And what do you think ATs are used for? Simply to speed yourself up beyond the perceptional ability to others?
How does it "balance gameplay"? It just took away options. Now we're stuck with fewer options to mindgame with.
Just because the ATs have been removed doesn't mean low tiered characters (if G&W and Mario) will automatically get a boost. In fact, they'll probably suffer from it because why did the low tiers suck in Melee? Because most of them were slow, suffered great lag on aerials and moves and couldn't combo or KO well. They will still suffer from all of that unless they were changed somehow.
Why whould n00bs get smacked to bits on their first attempt at playing the game? How many n00bs walk into a room and challenge an elite player, anyway? How many elite players hang out where n00bs hang out to destroy them?
If you're talking about the online system, very few competitive players are going to be playing With Anyone because it's 2 minutes of 4-man FFA on Time!
Also, you know what, if a n00b walks into a room, has never played a game before, challenges someone who's obviously played it before (if not until after the game where the player has shown that they know what they're doing), loses and then says "Wow! I just got my *** handed to me! How come I couldn't destroy this player who'd played the game a lot before on my first try?", then I'm kinda glad they're not picking up Smash.
Because that's the description of an idiot. Of course you'll get your *** handed to you the first time you play a fighting game if your opponent is good! Nothing will ever prevent that unless the other party screws up royally! The removal of ATs won't matter. If I practice and learn all there is to know about the game (combos, approaches, fakeouts, mindgames, etc.), I will still destroy people who've never played the game before or have very limited experience with it!
Nothing can ever stop that unless we introduce huge elements of luck where I could at any time randomly die no matter how hard I try not to!