Honestly, the only time I think "You pull it you tank it" is valid is when a dps ignores a countdown and just pulls the boss and ends up being an inconvenience for 7 other players because they couldn't be bothered to wait 10 seconds.

But then again, maybe that's just me and my pet peeve for impatient people who think they're more important than everyone else and feel entitled to inconvenience them for their own convenience.