If he's already in Endwalker then he should be used to pulling multiple packs. If he wants to go one at at time then used the Duty Support.

Just because you're the tank, doesn't make you the main character. There's 3 other people in the dungeon with you. I'm fine with stopping at the final boss for people to watch the cutscene if they're new, but pick up the pace during the boring trash packs. There's nothing scenic or "storylike" about slowly fighting the same enemies you've seen dozens of times before.