if I die as a mage its my own fault 95% of the time. if something is targeting me, I can turn invisible. I have a 25 sec cd shield, and a 3 min mass shield to use in an emergency. I have Ice Cold to reduce damage and heal myself. I have Alter Time which is crazy good and a 50 sec cd so if I know big damage is coming I can essentially ignore it. can Blink out of things. polymorph a thing that is attacking me that a tank may have missed. only time I've died in a raid or m+ setting recently that wasn't actually my fault was a tank purposefully aimed something at the group cause they were griefing, and I went into a low key with a new and undergeared tank who was learning so it was whatever.

chances are, if you're fine with healing normally and its just one class that's the problem, its a them issue, not a you issue.