I just can’t understand why the Linux kernel has avoided tracking completions for so long and has such hard time with async I/O. Windows has had IRPs and overla

I just can’t understand why the Linux kernel has avoided tracking completions for so long and has such hard time with async I/O. Windows has had IRPs and overlapped I/O for decades, asyc is the default and there just isn’t much reason to ever use synchronous I/O.