I think that in the end, "six" will be played mainly in duels, just like "five." The advantage of these battles is their brevity and clarity. It is in them that you can play with balanced armies and fully developed heroes, which allows you to determine the strongest!
Perhaps not. Nival simply became famous for its Demiurges, where there were indeed hero battles in the arena. And in the end, "five" came down to arena battles.
There is probably potential in "six" to return to the roots of the series. Namely, playing on the world map. The problem is that the system requirements are unlikely to allow the game to become as popular as "three." Not everyone has powerful computers and good internet.
I will wait for the game to be released, evaluate the multiplayer maps, and read about the developers' desire to make patches to improve the game.
If there is potential, I will organize a live tournament. So far, the game has not disappointed. It is still difficult to assess the balance; some overpowered unit will probably emerge.