There are definitely some regions of existing code where legitimately replacing the existing C/C++ functions with Rust is justifiable on its own. The big one I

There are definitely some regions of existing code where legitimately replacing the existing C/C++ functions with Rust is justifiable on its own. The big one I can think of is parsing code--things like parsing fonts (as sibling mentions) or A/V codecs are things that have historically been replete with exploitable memory safety issues and are reliably untrusted data.