Do you actually develop for a platform that (a) has a standards-compliant C compiler, (b) does not have a Rust target, and (c) has enough memory to be worth dealing with PDFs?
That’s simplistic. I maintain some large C and Rust programs, and I find Unix/windows issues much easier to fix on rust than in C, and supporting Linux and windows well matters a lot more than some obscure CPU Rust doesn’t support.
Much less portable than the C ecosystem though.