Tanking is the easiest role in the game by a fucking mile. Keeping up with mitigation is literally just I HIT BUTTON NOW OK??? and little else. Especially with how tankbusters so often end up going for the kitchen sink design, or are otherwise rigidly scripted to sync up with tank mitigation cooldowns.

Healing is really easy, too. Especially if you're progging and so don't care too much about losing a few GCDs per minute to the occasional safety Succor or something. I do wish they'd move more to soft enrages/phase enrages and HP thresholds, and fewer just 8 minute long scripts or body checks.