What would you change in Heroes of Might and Magic IV?

And yet, in the fourth installment, it would have been possible (and necessary) to change the ratio between the hero's strength and the monsters. It's still not right when a well-developed hero no longer needs an army and can defeat black dragons with a simple kick. After all, this isn't an RPG. Monster experience gain was implemented in Heroes of Might and Magic, so why couldn't something similar have been done in the fourth game?