Unfortunately io_uring is disabled by default on most cloud workload orchestrators, like CloudRun, GKE, EKS and even local Docker.
Hope this will change soon, but until then it will remain very niche.
Sandboxing like gvisor is based on syscalls and iouring makes your code syscallless
Security reasons. https://news.ycombinator.com/item?id=44632240 There are also other edge cases around cgroups accounting that renders some isolation/throttling mechanisms not fully effective.