Prah: realMyst is already on GOG as the Masterpiece Edition (and was also before that available, I'm not sure if it's included or not in the Masterpiece Edition). Since ReMyst is already available, as the superior ME, it's not for this list.
RenKalan: Thank you.
Though, original 2000's realMyst is different from 2014's realMyst (ME or otherwise). The original was delisted sometime in 2018 and never came back, not even included as extra content or "legacy" version or something like that. I miss the original realMyst...
This is an excellent point. I have realMyst - just realMyst - in my GOG library and still working on Windows 7, and it's an excellent game that should not have been delisted. From what has been said in reviews etc., realMyst Masterpiece Edition cannot be accurately described as just "realMyst but better", it's really quite different in terms of various artistic choices, beyond the higher polygon count.
If it were at least included as an extra, I wouldn't complain, but as things stand I'd say this entry definitely has its place in this list.