I believe the point is that this is http/3 support added to the nghttp2 library which has been around for a long time, longer than Rust's mainstream popularity started to build. While I haven't used it personally I have heard good things about the library it's good to see it continue.

Dismissing a new feature in an existing library seems quite excessive and possibly zealous. Or perhaps we should just stop using OSes entirely because they continue to release new features in memory unsafe languages.