visual indicators are not tied to language, which is constantly in flux.
Core Unix commands have not changed since the 70s my guy. The syntax of modern ls, tar etc are still 1:1 compatible with versions that predate the invention of the concept of a GUI. Go 10 years back in GUI design back to 2014 and see how similar things are to today.
The one exception to this is Powershell, which has the core Unix command names as aliases to the equivalent Powershell commands without any attempt to convert the flags between them. Microsoft really desperately wants to convert *nix programmers and sysadmins back to Windows, and they’re failing spectacularly because no one wants to use a shell where ls -l throws an error.
bash and *nix commands are an absolute immemorable mess.