> complete rewrites in Rust remain far more common than incremental ones, particularly when rewriting from a language other than C.

Well yeah, that has obvious practical reasons: unless you're using C/C++, you can't really link Rust code with your codebase (or you could theoretically do it, but in a way that would affect performance and/or complicate your architecture). So, if you're going to do it at all, a full rewrite makes more sense.