Zingel
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For example, skillful use of chains of hired heroes (for transferring troops and artifacts), timely and reasonable use of dismissal (firing/escaping with subsequent hiring in an external tavern on the other side of the world),...
... manipulating the arrangement of troop stacks in the hero's army (sometimes only one correct arrangement of troops allows you to avoid a movement penalty on the terrain, even without the Pathfinding skill), and so on.
Added 1 minute ago
Another important point was forgotten.
Humans (and others, except for necromancers) can be inspired! And they will make an additional move in battle. But necromancers move exactly once per round. This is a serious drawback.
Герои - это клёво.