There are other issues, but after the CC change to make interrupts matter, why are some specs still in posession of AOE CCs that actually work and circumvent the CC change you thought would make kicks so valuable?
VDH without Sigil is still a good tank
Prot Pally without silences could use a sturdiness buff
Interrupting shout could go away and warriors could get Spell Block back in some form.
Solar Beam can go away and all druids use skull bash
Silence can go to the Priest general tree and be a choice node with a 15s kick.
Balance from there and we’d be alot better off. This would have nearly ZERO effect on raids and yet for M+ it would make a world of difference.