Heroes 6 - Discussion

Even if that's the case, it logically means they should be in charge, and in that case, everyone would be strengthened. They can't weaken them – the idea of the main character would be lost.

What's wrong with strong abilities? The main thing is that they should be:
a) Interesting
b) More or less balanced
c) There shouldn't be a situation where one ability affects a huge number of parameters, like with the Knight debuff that you gave as an example. One or two truly significant changes to something. It's even better if it's not a change in parameters (if not everywhere, then at least more often abandon this), but bonuses of a different type that cannot be set through parameters (like in the fifth part, a rain of arrows or vision of elements).
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In practice, I got +3 to luck and morale (some skill, I forgot which) almost every round.

Well, I don't know what that is, since the maximum luck and morale are now =100 (although in a duel, the Knight's Inner Fire somehow gave +106 morale, but I think the extra points are "cut off").