Ywes, it does. Just being able to do it gives you an unfair advantage. Now you can move faster as well as move in and out of attacks easier. While I don't beleive in tiers, one can argue that WD started it. Fox can wavedash into a shine. While, that alone isn't much, adding it with a combo means alot. Marth is another eample. This speed up and his fast >smash gives him the ability to strike quick and efficiant. It puts some characters at an unfair advantage and makes fast characters faster.No,it doesn't.
You can WD all day with a character,it won't help you win at all.It depends on how you use it.And the typical"I think WD is unfair" arguement is getting really old.
Also, it's unnatural, and feels to much like a glitch anyway. Also, with online it puts the WDers at an advantage. Much like snaking ion MKDS you probobly don't know when they are doing it. And I assum some players would be confused as they wouldn't even know what it is.
Now, I beleive that L-canceeling and short jumps should be added into the player manual. They aren't the most complex, and aren't an advancement on previous actions. They're basic, just most people don'tt know about them.