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Regarding balance, you are wrong (or you only play as the Overlords). In very long games, Orcs and Magic users are the strongest. At the beginning of the game, the Mechanists and Chaos factions are the strongest. Unless Kaspar is used well. And it sounds like the Lich is the most useful unit. (yes, yes). In general, it's better to ask our tournament attendees; they will explain it to us. I recommend watching the RPGGames video "Why People Love Heroes V." It clearly explains why people love the fifth game. The AI has already been improved by Mr. Q, and the balance can be fixed.
Considering the possibilities that the developers HAVE given for editing their game, it is better than many others.
But there are no chances. Unfortunately.