At this point of time, being cross-platform (at least the 3 of win,mac,linux) is a basic 'hygiene factor' for programming languages. I mean, even experimental niche tools and hobbyist systems are expected to do that and almost all of them do.

I have access to all kinds of systems, but this is not a consumer item, and it should work everywhere; a mac-only requirement is just as unacceptably limiting for general purpose computing as a windows-only requiremet.