why? because you can't exploit glitches you consider "skill"?
nope
i don't actually play melee, but it's easy to see why people who do aren't ecstatic about brawl/4's physics. the game encourages defensive play in too many areas (slow dash reversal, multiple air dodges, low hitstun, etc). this cuts down on your options for approaching, making it more difficult to attack and slowing everything down
the devs were obviously more concerned about bridging the divide between levels of skill and catering to newcomers, as opposed to forming a more wholesome, option-rich competitive environment, where gaps in skill should always be obvious
i own sm4sh and love it to death, but i have absolutely no qualms with telling people i'd very much rather watch a melee match. even if you took away all the stuff you call "glitches", it's just that much better of a spectator sport