So suppose you're in an overrun, after a landing with flaps 30. Why would you retract the flaps afterwards? And IF you decide to retract them, why not until they are completely up?
I would imagine leaving the flaps extended might be best in case of an evacuation, even if triggered by an enthusiastic passenger sitting near an over-wing exit. Who knows what's really happening for certain after an off-runway excursion into the mud/grass?
On the other hand, if everything is fine and dandy and you decided to perform a normal APU start, After Landing Check List, and Secure Cockpit Checklist, why wouldn't you retract the flaps and leading edge devices all the way if for no other reason than to reduce speculation by people like us?
I don't get it.