I agree that top players must test this on ptr, probably wotb allowed is too much.
U don't need to fully reset the cd of mirror in one stun, u just need to deny crit rends, which are half the rends, at best
3 stuns in a row are doable and can kill a barb with good ehp, with the new RoF, especially with top dps, ~300k with soj.
I tested with mokkal on live yesterday, with tankier setup I had 204k hp, 1000all res buffed, 12k armor buffed, 1000dex for 30% dodge, -9% vs cold from ic boots, 32 block, -14 to elites, -6 to ranged ... And relentless.
I only had about 50k dps but he only had 50k life...he had no problem to burst through this even with the current RoF.
I did a little better with 4 piece Bt and only 170k hp but it was still pretty one sided for him... until I went to skorn hota and manage to 2 shot him a couple of times.
It's just an example of how metagame evolves and banning skills without A LOT of testing is not right.
With Bt set, buffed, vs elites I have around 11mil ehp with dodge, more with block but it depends on the average value of RoF ticks, against higher atk speed wizzards block should be better, but those wiz also reset with CM faster.
Assuming 300k base dps plus 30%soj (kaio has 330), dps with cold blooded should be around 400-450k
2.8 RoF is base but u get 3.6 with snow blast so around 1.5m per sec sounds pretty good to me.
Ofc in real combat there are more variables and testing has to be done.
Allowing wotb seems too much but allowing only one stun from wiz, and from barb (like current rules) is worth testing.