[someone_19]

> It's essentially impossible to write a Rust program without relying on many of its escape hatches like RefCell and unsafe, that make the borrow checker go away.

This is very contrary to my experience. I don't use cloning or various primitives (except when I really need the shared state).

I can assume that you have this opinion because you see it as a low-level problem while its solution lies at the architectural level.

Use pure functions, group data in structures that own it, get all the necessary data in the controller, process it, and return or store it.