IIRC the official reason for simply not porting kqueue to Linux 20 years ago was: "it's over engineered". Linux has a ton a brilliant developers working on it,

IIRC the official reason for simply not porting kqueue to Linux 20 years ago was: "it's over engineered". Linux has a ton a brilliant developers working on it, they had to know epoll wasn't all there, the epoll man page says as much. I've always suspected perhaps, maybe, potential patent infringement worries might have something to do with the broken design. If that's the case, fair enough, no one wants litigation.