From my perspective, that's partially because CMD is so stunningly incapable as what a reasonable person might think of as a shell. I'd guess the other half is the amount of pressure Microsoft has placed upon management tooling using PS

If Apple shipped some Swift-powered shell and all of their management documentation started using it, I'd bet a non-trivial portion of administrators would start to use AppleSwiftShell (although I do deeply appreciate that's a severely flawed comparison since macOS already has a sane functioning shell, but it's the best I could think of as a huge company that owns the platform pushing such a concept down)