Every time people lament changes to the lore that amount to "not every member of species X is irredeemably evil" and claim the game is removing villains from it, I think how villains of so-caleld evil species fall into two cathegories: a) bland and boring and b)have something else, unrelated to their species going on for them, that makes them interesting.
Always interpreted planar creatures as having an alien thought process in general. That is a good use of devils ngl, for related playing pallies/clerics with 'my higher power is the people' is quite fun.