[Stun/Sleep] Cold Takes: We don't need these anymore. But do we?

I am a very simple all-rounder--I Maxed out my Tanks, I'm slowly working on maxing out DPS (working on SMN rn), and I'm slowly beginning to chew into healers. My biggest question is:

Why do we need stuns and sleep when anything post ARR besides fodder resists it? Don't get me wrong--interrupts are WONDERFUL, but what's the point of having something that is resisted by at least a ballpark figure of 40% and it's in the major chunks of the game?

I think it'd honestly be better to remove them, but at the same time they are so crucial to early game. What do you think?