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.
I'd love to be literal devil's advocate here and argue devils just think different, in ways usually not immediately beneficial to in-universe society but ultimately a plus by instead providing a stress test for development of what is in universe considered 'good'. Insert the quote from Legend what is light without dark.
Understandable - I prefer lovecraftian and fey creatures for alien thought processes, and use devils more as a foil/mirror to the lawful god of cities, merchants, and wealth, whomst I hate and will take any opportunity to drag.
I see Fey not as alien, but as capricious. They do what they please, when they please, damn the consequences.
They might commit arson against a local noble and then give that noble’s kid a super fancy cake; and not have a reason for either beyond “lol, lmao”
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.