A fair balance means a game without morality, luck, using identical heroes and cities, where the winner is the one who calculates everything more accurately.
1. Remove morality from neutral creatures.
2. Add a hint about the upgraded stack.
3. Open the entire map (your side) from the start.
4. Show the contents of an object when you right-click on it.
5. And have the same sequence of heroes in the taverns (the most difficult of the above).
This will result in a kind of semi-offline game.
Regarding balance - in my opinion, a situation is imbalanced if one player played close to the optimum, and the other played noticeably worse but still won. A situation where both played close to the optimum, but one had better luck with morality in the Fortress Battle, is not an imbalanced situation.
Accordingly, gameplay can be considered balanced if the percentage of imbalanced situations does not exceed 5-10%. So far, in all the games where I have watched mutual replays, I have not seen a single imbalanced situation - in all cases, the reasons for defeat were due to mistakes made by one of the players, often quite obvious ones.
This does not mean that such situations did not exist; they probably did, but there are not too many of them.
