Make it so that all displacements render the champion untargetable (like poppy ult)

Its only fair considering that knock ups and knock backs cannot be diminished with tenacity or cleansed. Even if you QSS a knock up, you STILL can't do anything and will STILL continue to fly through the air unless you overrule the displacement with flash, a blink or a dash.

I mean it wouldn't be much of an issue in the first place if they were fairly rare in the game, but honestly they just aren't anymore. We have knockups for breakfast lunch and dinner in this game. The new champion Ornn isn't the cause for this, he's just a symptom of the problem.

(I suppose Yasuo's ult would allow him to target champions that are airborne otherwise he wouldn't be able to ult anything)

The cc of knock ups is too damn reliable, and it makes it far to easy to start a cc chain. This isn't tekken for fucks sake. Hell, even in tekken launches are punishible-- in league knockups are just easy reliable chain cc starters with no drawback or real counterplay apart from not being hit by whatever knocked you around-- and that isn't generally a valid form of counterplay for most melee champions.