Most Linux distros don't claim to be POSIX compliant. (In fact, software on GNU/Linux in general doesn't claim to be such. Sometimes it's taken as a guideline, more often ignored entirely.)
I get where you're coming from, but there's an enormous ecosystem of software written for posix. You wouldn't just be starting over with new standards.. you'd be tossing out a whole world of software that we already have.
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