Making it short. I don't expect healers or tanks to do dps, but if it means helping againt's enrage then yes. Best mitigation for a raid group is less mechanics or a boss getting killed faster. I rather do things faster than slower and make it more unsafe, because more mechanics shows up and that means you need to deal with more, which means again more chance of wipe

Examples are those people who don't do content till they are in echo or nerf, so they can skip mechanics to deal with less.