Cover is actually incredibly useful in cases of bosses that auto attack both tanks. E8S in my experience it is common in pugs for the other tank to mistime KR or die due to improper mitigation+healer failure, cover allots time for the healer to get the other tank back up without DPS dropping like flies. if anything, my main complaint is not being able to cover SPECIFIC damage types anymore (Ex. if somebody get stunned staring at shiva when she goes light form) you can't prevent damage from being taken by the player, in which case intervention wins out.