much more approachable, boats has written about challenges integrating in rust: https://without.boats/tags/io-uring/
in the most general form: you need a fairly "loose" memory model to integrate the "best" (performance wise) parts, and the "best" (ease of use/forward looking safety) way to integrate requires C library linkage. This is troublesome in most GC languages, and many managed runtimes. There's also the issue that uring being non-portable means that the things it suggests you must do (such as say pinning a buffer pool and making APIs like read not immediate caller allocates) requires a substantially separate API for this platform than for others, or at least substantial reworks over all the existing POSIX modeled APIs - thus back to what I said originally, we need a replacement for POSIX & BSD here, broadly applied.