There's already a plethora of shells that fit that domain:

  + Nu Shell
  + NGS
  + Powershell
  + Oil Shell
  + Elvish
  + Murex (which is one I'd written)

Not to mention all the LISP, Python, and other such high level language REPLs come shells.

But they solve a different problem. This seems to be more like what Typescript is to Javascript: a alternative "safer" language where your end point is limited to supporting a different language. So you need to compile down to a known portable base language.

Better in that you can use it directly, not necessarily great for interop. I love Fish shell, but it can be a pain when trying to use tools that expect posix syntax to work.