Sure, Apple won't stop you. But the defaults matter. If you're writing a shell script and you want it to run on MacOS, you need to target the ancient version it

Sure, Apple won't stop you. But the defaults matter. If you're writing a shell script and you want it to run on MacOS, you need to target the ancient version it's actually shipping, or you have to tell your whole team to install a later version. If your servers are running Linux then you'll be dealing with platform inconsistencies all day long. Ask me how I know.