And note: browsers are the pathological case, in terms of build system integrations, global state assumptions, C++, etc.
(Your other complaints have a place, and don't seem unreasonable to me. But they're empirically not impediments to Rust's interop story.)
[1]: https://chromium.googlesource.com/chromium/src/+/refs/heads/...
[2]: https://firefox-source-docs.mozilla.org/build/buildsystem/ru...
[3]: https://www.memorysafety.org/blog/rustls-nginx-compatibility...