It only lowered the amount of Tech skill needed to play, which smash needed gravely.
and yes, more tech skill needed = people with dominant tech skill need to think about their game much less, they can just abuse long combos and wavedaashing and whatever the enemy doesn't know, and once the enemy has the same or relatively the same amount of tech skill, then it's all about basic strategies, which is the core of competetive gameplay.
just because you need to run and press Z in order to grab, instead of jump, air dodge to the ground, jump, air dodge to the ground, jump and quickly press Z, it doesn't make grabbing a more\less skillfull technique, those things caused more problems then they were worth it IMO, if Wave dashing had a button in brawl, but retained all of it's previous traits, then no one would use regular dashing, and you'd still have the same amount of strategies...
Edit: I would like to disagree, without the new stale moves factor, abusing the same attacks over and over was done all the time in Melee, I.E Fox's Shine, or Drill, Peach's Dsmash or Fthrow, Marth's Fsmash or Fair or Utilt etc' now that you actually have to account for staleness and revise your strategy, it makes for smarter play.