For me, I just find it very dubious when folks point to POSIX as a point of stability. The reality is that POSIX is so barebones in a number of respects, that m

For me, I just find it very dubious when folks point to POSIX as a point of stability. The reality is that POSIX is so barebones in a number of respects, that most "POSIX tooling" actually has more features than what POSIX specifies. And sometimes the behavior of those features differs across implementations, with sed's `-i` flag being an infamous example. As I pointed out, the main problem is that, other than POSIX experts who have memorized the spec, most folks have no idea when they're crossing the line between "POSIX specified" and "extra feature." I agree that stability is really the main important bit here. That is, is that script I wrote using your tool 5 years still going to work the same way today? And that is exactly my point. Because this discussion is totally different if we focus on what actually matters (stability) instead of some flawed idealistic approximation of it (POSIX) that only actually exists in theory. Because even the most spartan of tools, like busybox, implement features beyond what POSIX requires. And people use those not because they are in POSIX, but because they are in practice, in the real world, stable. In other words, folks harping on POSIX as an end have confused it with what it really is: a means to an end.