Some cutscenes are long (I'm thinking Totorak and Stone Vigil here) I have lost count of times I've seen my party wipe because the tank wouldn't wait fot the person/s watching the cutscenes.

I also think it's pretty rude to go ahead and pull when you can clearly see one person - or more - aren't ready. Telling them they can watch the cutscenes some other time is very selfish; they are doing the story NOW, not some nebulous 'other time'. And what happens if every time they go in the dungeon, they get another impatient tank (it is generally the tank, I don't think I've seen anyone else do this).

You say 'the good people' as if it's a term of abuse. Since these 'good people' are the ones who are generous and unselfish enough to let the sprout watch the cutscenes without impacting their dungeon experience, I think that says a great deal about you, OP