Having a new "gravity" mechanic wouldn't hurt the game, would it ?
Like imagine a new mechanic (added either on an item or a champion) that would make a "field" where champions would either be immune to knock-ups OR simply make knock ups last longer. Since it's been stated numerous times that tenacity feels completely useless because knock-ups work the same as a 1.5 second stun and have no way to either be reduced or enhanced, it'd be fun to actually "control" this one. Maybe as a support item or a new champion completely relying on gravity ?
Just let's take a look at true damage, it used to be a really rare stat, and the only champions who had true damage to their kit were picked for a special reason (
against heavy tanks,
for his "deleted" scary ultimate), now everyone has access to true damage and can "control" its amount. I'm pretty sure the same done to knock ups wouldn't hurt the game