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Yes, if a map is designed for human players, then playing against an AI opponent on the Champion difficulty level probably doesn't make sense. I recently remembered an interesting map that I couldn't complete because a passage was blocked. And then I realized that it wasn't a map error – this passage was supposed to be opened by the opponent, who had the ability to do so – but on Champion difficulty, the AI is afraid to fight. However, in single-player mode (RPG, or whatever it's called), there can be an interesting storyline, and enemy heroes have predefined behaviors (they don't start at level 1 and without an army). There, you can play on Champion difficulty. But when you level up significantly, the monotony of battles with neutral creatures becomes tiresome. And it's undesirable to use auto-battle – the AI does unpredictable things. Recently, I clicked on auto-battle, and instead of giving the enemy a couple of blows and moving on, the heroes started casting some kind of magic on themselves – apparently, their initial magical education had an effect.