For better or worse (personally I say worse) interrupting–a lot–has become a life or death pass/fail mechanic all over the game. At this point (since a long time, really) it is objectively incorrect game design for any spec not to have access to it. Like this person said so well in the mobility thread:
Blizzard is unbelievably bad at using simple solutions to fix simple problems. Their obsession with “unique and different” is why some specs have to jump through hoops to do stuff others can just by pressing a button or two. If they could ever exercise common sense and realize “homogenization” is not the mortal enemy so many have been brainwashed into thinking it is, overall balance would be miles better than it is now.