I think it's a huge shame, as Rust is one of the few languages that tracing is effectively native in, and it's shocking that the defacto standard of tracing transport doesn't interop well.

Admittedly, I think part of it is just where Rust is on the language adoption curve and where Otel is in its project lifecycle as well. Writing your own subscriber might not be a terrible idea, we internally end up needing to do similar things as we find limitations/bugs that we can't wait for upstream to fix (but we're a vendor and that makes more sense for us than end users!)