It's certainly up to them if they want to rewrite everything in Rust. I'm just saying the net benefit just does not exist for stable software like librsvg or bzip2.

> Is there something intrinsic to Rust that would lead them to this error? (no, I think not).

There is nothing intrinsic to Rust that creates this kind of problem, besides it being a different language than the project was originally written in. I'm sure Go, Swift, Haskell, Java, or any other language (with the possible exception of C++) would have similar issues. No other language community is quite as arrogant as the Rust community though.