Yeah, but why the assumption that those things are an issue? We're talking about mature codebases. Rewriting it again in C would also give you a chance to start fresh with better tooling, lessons learned, paying back tech debt, etc. Even still, you're going to introduce new bugs in the process. You might fix a few hard-to-address architectural issues, but all of the other bugs would be easier to fix in the original codebase than by rewriting the whole thing.

I'm not saying that a rewrite is never justified, but rather that the argument that we should rewrite in Rust simply to avoid bugs has little weight.