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

Different creatures are chosen depending on the specific enemy castle! IMHO, this is a good thing!

But it would be better to have 7 levels. Because it's more enjoyable to have both. But of course, it would cost more money. By the way, I would also reduce the construction cost of the Elves. Because the guild of Rangers and treehouses become quite expensive due to the excessive consumption of wood.