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

Recently, out of curiosity, I installed Heroes III WoG Classic Edition HD, which received some positive reviews. Technically, the build is well-executed; they removed some of the more outlandish elements from WoG. However, regarding the upgrades, some monsters still only have 1 upgrade level (like in the classic version), while others have up to 3 upgrade levels with unbelievable stats. Demons upgrade into horses, birds into lizards, and so on. In short, there's no system; it's just a game born from a deranged imagination. And after this, someone is still unhappy that they removed upgrades in the fourth game to avoid ruining a well-designed game.