While possible to do in other languages, I think of it this way, "why NOT have it in a language new to people?"

I'd rather it in something new to me (scheme) than be shoehorned into a language I know already. That way I can gain additional benefit of seeing similar concepts in a new form.

Trying to protect someone from having to learn a new language just doesn't make sense, like protecting people from regular exercise. Everyone should have the benefit of knowing multiple tools, and a language should be no exception.