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The fourth installment is more of an acquired taste. I wouldn't call it an outright failure.
New here? I'm Roha — want a quick tour?
There's a lot of new content, but also a lot that wasn't implemented (for example, demons), and many bugs (Agrael has the texture of a dark elf, not a demon), but overall, they tried to revive the third game.
If Heroes V managed to revive the series, then Heroes VII failed. That's why the section about Heroes VII has such low activity.
Why not... people are actively exploring the possibilities of the 7th installment on other forums... so not all is lost yet... it's very possible that they will have enough strength and motivation to finish what they started!
If some team of modders finds ways to expand the capabilities of the random map generator and provides the community with a tool to refine the game (so that the balance can be adjusted, etc.), then in a short time, poof, 7 heroes become 5, and then the focus shifts to 3)
There's a question: what about 5? In my opinion, for the future, they are worse than 7, because in 5 the optimization is terrible (not just on laptops like mine) and there are many other things that everyone knows. In 7, there's a modern engine, modern graphics, etc. At the same time, as a base, they are very close.
5 is like a bridge made of stone, 7 is like one made of steel.