Haven discussion.

receive less damage when defending

Interesting. Here's the ability description:

This skill can be improved. Depending on the skill level, creatures under the hero's command deal more damage in response to an enemy attack. This reflects in the game the fact that heroes and creatures of Haven belong to a race, an army that is well-organized in battle and prefers physical strength in resolving conflicts.

As you can see, NOWHERE is it said that they deal less damage in battle. They receive the same amount of damage, but they hit harder...
Moreover, considering this feature, for humans, it is most advantageous to simply use Defence throughout the entire battle. Because in response, the troops will deal more damage than just fighting, and their defense