Operating System

Hello, /prog/. If you had the perfect operating system for writing games in, what features would it have, and what features would it lack? What qualities does the perfect operating system have, and what qualities make you want to stab the people who programmed the OS?

everything is a file
microkernel
as few axiomatic things as possible
something like 9P/Styx (sort of like the above)
documented to hell and back