This was exactly my reticence... back when I was learning various approaches and trying to come up with a first-principles derivation of which way to go, I came to the conclusion that I wanted to avoid immer like the plague. So discovering that RTK requires it has made it difficult to consider embracing.
I'm very curious, what concerns do you have about Immer? fwiw I just wrote a sibling comment that goes into some detail on what problems Immer solves and why we included it in RTK:
Still worth it though, imho - if you have a chance do give it a try. It makes Redux much less verbose and is an ideal abstraction for state management. It never bothered me that much, but forking Redux Toolkit and removing Immer is still an option if you feel strongly about it (should probably be easy).
