Sure, but that's the Plan 9 philosophy. UNIX doesn't even have /proc/$pid/fd/ - there's no way to refer to another process's stdio unless you have the fd passed to you, and stdio is kind of the basis of UNIX. So by UNIX's definition of "everything is a file," we're still there.
As mentioned earlier, Plan9 is what UNIX research edition 8 grew into (as I understand it), it's possibly one of the best examples of the UNIX philosophy.
It's important to note that UNIX the actual implementation is a moving target because of the many versions, just because the designers didn't see something could be achieved in UNIX (resources, time, effort, etc.) or just plain didn't think about it, doesn't mean that it doesn't embody the UNIX philosophy :)
