I’d say you’re just not seeing the detriment of their inability to function on bosses.
I’m curious which ones you think aren’t completely immune. While I didn’t sift through the entirety of the boss catalog, both phases of Warden Krieg, Cronley, and Karroz are completely immune to Freeze and Stun with “essentially immune” status for Petrify and Entrapment (98%).
Thankfully, Bolvar has what I would consider “fun” levels of CC resistance. Just enough to make most applications be reduced to sub-second times, but not so much that it’d be unnoticeable.
And here’s the big issue that I have with this.
If THE UBER ENDGAME ELITE wants to CC a boss, it can. But what about everyone else? The only people that can get some microsecond interruptions on boss AI are the ones that don’t need it in the first place? So instead of coming up with unique, isolated solutions to difficult problems, the game becomes “get more stats” (resists, health, etc.) What if instead of needing to overcap your Aether resist by 50% against Ana, you could apply a 0.25s stun via Shadow Strike or Grenado to cut off her Devastation cast? Is giving a higher skill ceiling to those with “poorer” gear collections such a bad idea?
Polymorphing or silencing or otherwise interrupting bosses in WoW has been core for years. The break bar in Guild Wars 2 is a unique spin on the same basic premise (commit resources over time to CC a boss before some party-wipe mechanic). Basically anything can be CC’d in PoE/D3. Why is GD committing to a fault on this antiquated ideology?
I don’t think anyone but the naysayers (cough cough) have mentioned chain-CC’ing enemies in this thread. But chain interrupting? Sure. It’d be pretty RNG-heavy.
I don’t know about you but I just looked at my three most recent builds and none of them have any hard CC whatsoever, other than knockdown, and I give knockdown a bit of a pass because it requires animation work (something standing back up) to make it “look good.”