You can do that via much simpler message passing instead. No "thread-safe types", no "borrow checkers", no "verifying and upholding all the requirements manuall

You can do that via much simpler message passing instead. No "thread-safe types", no "borrow checkers", no "verifying and upholding all the requirements manually". The downside is you are sacrificing performance. Rust is for high performance, high concurrency applications where the developer can spend all day building them.