I think Construct 7 is a perfect example of the necessity of enrage mechanics. That fight can take upwards of twenty minutes of pure torture if people aren't actually paying attention. I still remember when that raid first dropped and almost every run was like that - just one arduous grind where bad players got the carry while every rez-capable role was working their tail off to get people up. It's easier /now/ but christ on a crack an enrage timer would have made that fight so much more manageable. An enrage timer isn't just punishment for bad DPS. It's a chance to stop, reset, and think over what's going wrong in a fight.