i was going to suggest ... ??restricted nature of "accidental topos" / "accidental abelian category" (as compared to tops /abelian category in general ... ??) as going against "doctrine philosophy" .... but ... not really ?? ... ??because even before you get to that issue, the "accidentalness" already makes things weird ... ??? ... ???.... ??making other alleged weirdness not so relevant ?? ... ??? ....