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 argue Devils, by their nature of being lawful as well as evil, are often interesting villains because of their "species", but it's kinda different when it's a creature literally made from the primordial essence of Evil rather than just a bad dude.
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”