Maybe it is, but the classic dungeon gameplay involves mines. If you rework other heroes, you'll end up with World Tree gameplay. Do you really need that?
So, in your opinion, everything that has anything to do with or resembles World Tree is inherently bad? That's an interesting approach. However, the vast majority of top players would agree that the World Tree idea was the best thing that ever happened to Heroes 3, as a form of esports. Just because the project stopped developing and died, does that mean you should start criticizing it everywhere, whether it's appropriate or not? Yes, that's very mature.