If you only ever ask it for trivial changes that don't require past context to make sense, then chat is indeed overkill. But we already have different UX approaches for that - e.g. some IDEs watch for specially formatted comments to trigger code generation, so you literally just type what you want right there in the editor, exactly where you want the code to go.
I'm sorry I can't substantiate it more than that, as my own head is still trying to wrap itself around what I think is needed instead. Still, sounds very "fluffy" even when I read it back myself.
