I'm going to preempt the poll results already, with not being very far into the week and ask 'Is it really that important to clear out the level?'. I mean, the one thing I would have learnt from playing Angband, as the maintainer points out:
Breeders are there to teach you two somewhat related but very important lessons: sometimes, running is the best option; and that not all creatures are worth fighting.I would have expected more intelligent behaviour, picking fights, gaming the system, admissions of stair scumming and so on.
Well, at least except for the stair scumming, I would expect the poll results to not be biased too much, unless the people responding to the clear the level question are also obsessive about having to answer the poll questions on every blog that they visit. So, is this just an indication of a self-selecting survey? Are roguelike players channelling their OCD?
In which case, I'd better start redesigning Unangband. Because I've designed the game to have levels that are deliberately hard due to the make-up of monsters in the ecology. And have nasty features all over them, which room descriptions are there to warn you away from. And rooms that are not easy to tunnel the corners out of so you remember whether you've cleared them or not.
So clearing the level is really non-ideal behaviour, as far as I am concerned.