Entire kernels have been written in Rust with less than 10% unsafe code. The entire line of argument that "the majority of code" needs to be unsafe in such contexts is BS.

Especially when the "Rust culture" suggests building safe abstractions on top of unsafe building blocks, which tends to keep the unsafe code pretty well-contained to a small section of the codebase. There's plenty of Rust frameworks for microcontroller programming (embassy, etc.) that don't involve much if any unsafe Rust at all.