Casuals didn't hate L-canceling and Wavedashing in Melee because they didn't have to deal with it. They hated Snaking because they had to deal with it if they wanted a remote chance at winning. They're forced into something they don't want to do in something they want to do. Ever hear of firehopping? It's a minor tech in MK8. People hate a tech that doesn't even give a palpable advantage. Obviously including major techs in SSB4 would cause a significant uproar alia MKDS.
And I never said the other 'techs' are pointless, just 'techs' in general, including other series.
Techs are there to give people more options (or, sometimes, because a developer had an oversight or two).
Someone who knows how to wavedash, l-cancel, usmash OoS, crouch cancel, and/or crouch cancel from dash isn't necessarily going to beat someone who doesn't know or use any of it.
It's all about how you incorporate the techniques into your playstyle.
If someone refuses to use something that's at their disposal and truly wants to win, then they should expect an uphill battle.
If someone wants to pick up a game and play it, that's fine, but if someone wants to pick up a game and be good at it, they shouldn't complain that they have to work for it.
I played a bit of UMvC3, and there's a reason I don't use Magneto or Felicia -- I just can't do their stuff, so I looked at what I can do.
The same could be said for Smash -- if you can't do well with your character or are upset that other people are doing better with that character, maybe it's time to find another main.
In Mario Kart, it's sounding like snaking gave an absolute advantage, so I'll give you that, but techs in general aren't pointless.
Brawl's tech didn't really raise much concern, and yet they were techs that still gave people an edge over others.
People flock to wavedashing and l-canceling as if that's all Melee was and what made competitive players good, and really, that's wrong; fundamentals combined with technical knowledge are what make them great.
I love playing against casuals in Brawl because it's good to take a break from more "serious Smash", but I sandbag a lot because I know these people don't want to learn the game like I do, and that's cool.
However, on occasion, I'll throw in a semi-serious match or two because some people are interested in improving (and others just want to see that one uppity guy get smoked).
Most of the time, I do well because my fundamentals are decent, not because of techs.
I did a Snake ditto in a tournament with someone who didn't like to use grenades, and I 3-stocked him -- he told me he would definitely start learning how to use them after seeing what I was doing with them.
Speaking of Snake, he has a tech that covers a fairly large portion of the stage, but anybody with decent fundamentals can punish it -- it just takes work, and if you don't want to put in that work, you've only got yourself to blame (not speaking directly to you, but in general).