POSIX compliance (which probably only serves as a checkbox for some arcane procurement guideline) is only relevant in niche markets. You are trying to apply a g

POSIX compliance (which probably only serves as a checkbox for some arcane procurement guideline) is only relevant in niche markets. You are trying to apply a general software design thought process which unfortunately doesn't work there. People still ship WinCE and '95 software. Software targeting old UNIX systems is still being written today. BTW, I can purchase a copy of windows 8 today (which is going to be supported by Microsoft till 2023) that is POSIX compliant. So the argument is moot anyway.