It ism't even trying to have the same mechanics as Melee. It has implemented a bunch of stuff from brawl like glide tosses, rar, dacus, pivot grabs and glides, and has also come up with new mechanics like crawl tilts, air glide tosses, multi tap smashes, a third sort of tether recoveries, OHC, etc...
I mean they even put a flash on L cancel. If you need something that screams "we actually question the mechanics in Super Smash Bros Melee and believe they can be improved a whole lot", there ypu have it.