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What's so difficult about it? Well, enemy units will become larger, battles will take even longer, and they will be even more exhausting. My complaint isn't about the ease of battles, but about their sheer number. You can't walk ten meters without getting into another typical battle, and there's nothing else in the game. Grinding, suppressing boredom, fighting through monotonous, repetitive battles. It was still interesting to get all the spirits and try them all out, but then it's just more boredom. There are no interesting events, features, or things that liven up the gameplay – just sleep-inducing, monotonous battles and quests that involve battles.
OH, I SAW A NEW UNIT AND I CAN HIRE IT, but what's the point? What's the point of yet another typical unit? To look at its animation, and see how much damage it does with its ability "deal damage"? Is that the point of the game?
In Heroes, you need to develop your castle, allocate resources, and fight against the enemy. Fighting neutral creatures is possibly the most boring part of the game, and here it's the main goal.
BORING.