You probably know more about this than me, but hasn't Linux had epoll for like 25 years? And BSD/macOS with kqueue? Doesn't that give you async IO? Or are you

You probably know more about this than me, but hasn't Linux had epoll for like 25 years? And BSD/macOS with kqueue? Doesn't that give you async IO? Or are you claiming that io_uring integrates async IO throughout the OS whereas epoll didn't?