And this is because there is nobody with authority to force the right solution. Compare POSIX to the Java spec: without Sun forcing coherence, "write once, run

And this is because there is nobody with authority to force the right solution. Compare POSIX to the Java spec: without Sun forcing coherence, "write once, run anywhere" would have died very early on, and we'd be saying the same thing about Java as you've just said about POSIX.