So if that happens can we buff all other melee champion's movement speeds, because I'm sure other melee champions stuggle like Garen does?
If they're too fast to kite then we need to buff

Maybe make all ranged champions a lot more tankier and really nerf the rest of melee champ's damage because now all melee champs are going to be fast, tanky, and deal a bunch of damage. The whole point of tanky champions like Garen is to be kitable, and only do a bunch of damage when they get close to you. Getting close to someone as Garen or something takes skill. Learn counterplay? Or how to properly farm underneath the turret? Garen vs Zed would be an easy matchup, since when does an assassin beat a tank?