wa2ise
Now if this place was "off campus housing" for college students, chances are that one of the students would fit a bed in that walk-in closet (assuming a bed would in fact fit flat in there). Most college students hate having to share a sleeping room; a separate (no matter how small and crampt) sleeping room is still highly prized. Doesn't matter if there's no window; the ability to shut the door to keep noise and light out is all that's wanted. So yes it should get an AFCI.
That would strictly be from a personal opinion not anything to do with what the NEC requires right?
They might bring a hot plate into this closet turned bedroom, does that mean we should bring two SA circuits into the close just in case?
If they are desperate they may use a cup in this room as a urinal, so now it's a bathroom?
IMO this is ridiculous, a closet is a closet, a bedroom is a bedroom.
AFCI protect the closet if you want to but it is not required by the NEC. (Yet)