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In fact, SoD and WoT will only thrive together. Let's say SoD was killed off in WoT, and they won.
But a year later, this forum will have the same level of activity as it does now on Bay. Because a new player, before becoming an online player, plays the single-player game. They discover that Dungeon is better than Inferno, and Rampart is better than Stronghold. They take particular pride in winning with a weak castle against a strong one. And this period, when players are captivated by the game, lasts a long time, even after they learn to play well.
To give them a bland game where all castles are balanced and homogenized, where the game needs to be viewed from a purely competitive, mathematical perspective, is to turn them away from Heroes. For them, such a game will become "just another game for a couple of weeks."
Regarding mathematics, it seems like you're projecting your own views onto people. Many come to Heroes after playing other esports games, and in terms of mathematics, balance, and competitive dryness, those games are much more demanding than WoT.
In StarCraft, for example, a serious game in the early stages is a clash of pre-prepared strategies, build orders – calculated down to the second and mineral by mineral. There isn't much romance, immersion in the game atmosphere, etc.; people come there specifically to cynically compare their skills.