Hi, I believe I understand you. If you look at immutable data structures implemented using JS primitives, it will surely look terrible. However, there's a lot of benefit to using a FP approach like Redux.

It's much easier to reason about state updates if all you have is pure functions. It allows you avoid very annoying and hard to catch bugs. I've seen this personally, when replacing a spaghetti component with a straightforward `useReducer` hook.

Unfortunately, we don't really have a performant way to express this pattern in JS (or even in other languages?). You could use something like elm-lang, but it's not as widespread.