Or they just don't like sword/shield combo or axes. It's why I neglect my tank characters.
I did this a couple times and then stopped. I'd prefer that it wasn't an option at all like other games so that parties have a good chance at finishing runs (not all parties who lose members are bad parties, sometimes ppl disconnect, have to leave for an emergency, etc) but as long as it remains a choice that very few people use, I won't use it either.
Four queues into an empty dungeon taught me my lesson.