Imagine you're a big bad, and your opponent summons allies from between worlds. And no matter what you do to them, they just can't seem to die. Their wounds heal. Their torn flesh regenerates. And they're bending light in such a way that it causes you physical agony.
This is how I coped with playing WHM through the MSQ. But the actual gameplay element did not match up with the fantasy of it at all, you're right. At the end of the day, you're doing the most boring setup of all time, and often feel like you don't belong in cutscenes. I switched to a dps job for endwalker and it felt right in a lot of ways.