It gets rid of DoubleBarrier and MiniGOATs, which means you don’t need so much Chaos to cut through that level of tankiness.
It also means you need to forfeit some valuable offtank abilities to have access to Mei CC
Booped around by Lucio, pushed over by Hammond, flung all over the place by Doomfist, slept by Ana, frozen by Mei and hooked by Roadhog.
Now repeat after me; “We’re having so much fun playing against that!”.