I don't get it, WSL is fundamentally not a mass market feature. Meanwhile the "Unix interface" on MacOS is ancient stuff that everyone who actually wants to use it immediately replaces wholesale with something from brew or whatever is en vogue.
You're right in some sense. The Unix interface (Darwin) is the POSIX api & toolchain that Homebrew tools are built on . Yes the included CLI tools are primitive. That Homebrew works so well IMO is a testament to Darwin