Personally I dislike subset languages because you end up with something that’s familiar yet incompatible with half the tools and libraries you’re already familiar with.

I’d rather learn something new.

Plus once you’ve learned a few different C-like languages, it’s usually really quick learning others. Something like this looks like it would be really easy to learn if you’ve already got familiarity with C (or similar). It’s not like having to learn Lisp or Datalog if your experience is in Java or Pascal.