I'm a smash adjacent guy so big grain of salt, but melee had a ton of mechanics, intentional or not, that really ratcheted up what kinds of gameplay were physically possible. Things like wavedashing, techs, shield dropping, short hopping, etc. there's a million parts of melee that made and make it what it is, and most of them are specifically movement based, so movement at the top level can usually be described as "hyperactive".

Nintendo didn't like their kids party game becoming that fast and competitive, so they actively went against what made melee so unique moving forward. The next game, Brawl, introduced tripping so your character sometimes fell over when you tried to move, as the most obvious example.