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

As others have said, each hero should have a unique specialty. Otherwise, they only differ in their portraits and biographies

Exactly, what's the point of having a tavern with such a great selection if all the heroes are the same? Choose a biography that's more interesting or a portrait that's more appealing?

I just want each hero to develop in a specific direction from the start, so they don't just differ in appearance, so the player thinks about who would be better to take.

For example, you can choose a hero who differs from others with a more attractive face and turn him into anyone you want. But isn't it nicer to find a hero that you like, who already matches your favorite tactics and skills?