Earlier quoted context omitted.
What you ask is what many outside the Linux community are so annoyed and frustrated with. The Linux communities complete inability to look outside their echo chamber. Constantly reinventing the wheel poorly and in a broken screw portability way. Instead of hacking together cgroups and namespaces they should have simply ported the jail framework. Instead of epoll they should have simply adopted kqueue. All they see is…
And Solaris has zones and I/O completion ports. So what?
And your comment has absolutely nothing to do with Linux or the Linux community.