I'm personally not a fan of monster-characters because it destroys the purity of good and evil in the game when you can have a friendly relationship with a monster and suddenly killing monsters becomes a moral gray area for any character who doesn't see violence as the first option for conflict resolution. Not that moral ambiguity isn't interesting in some settings, but in D&D it's annoying if a DM starts making you feel bad for killing ogres.
The themes of racism and imperialism are already contained in the relationship between the Netherese and other humanoid races and barbarians, we don't need to make good adventurers second guess the morality of wiping out orcs.
The whole point of monsters should be that they are evil and can't be reasoned with because violence and cruelty against humanoids is something they have an undeniable urge to enact as a result of being pawns of evil deities that have no qualms about depriving their minions of free will.
Since monster characters are a thing and I'm strictly against taking anyone's character away I play the game the way it presents itself, and my character wouldn't kill someone just for being a certain creature if they can be talked to and reasoned with, but as a player I prefer if there is no moral quandary when it comes to killing monsters.