you can look at rust sources of real system programs like framekernel or such things. uefi-rs etc.

there u can likely explore well the boundaries where rust does and does not work.

people have all kind of opinions. mine is this:

if you need unsafe peppered around, the only thing rust offers is being very unergonomic. its hard to write and hard to debug for no reason. Writing memory-safe C code is easy. The problems rust solves arent bad, just solved in a way thats way more complicated than writing same (safe) C code.

a language is not unsafe. you can write perfectly shit code in rust. and you can write perfectly safe code in C.

people need to stop calling a language safe and then reimplementing other peoples hard work in a bad way creating whole new vulnerabilities.