HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

What I don't understand is this: you have SoD, you have 2.98, you have 3.2x without the plus, and no one has touched them; they exist as they were or as they are.

Yes, it seems obvious – some functions that are undoubtedly useful FOR EVERYONE (passwords, quick keys, and maybe something else) are only available in HD+. When people are faced with the choice of either playing without useful functions or with very questionable new features, it's disappointing.
That's why the suggestion arose to move what this forum needs to HD, and then HD+ can be made for any other forum.