Difficulty Level and Declarations of War

[Prussian to the Iron]

The thing that really annoyes me is that after the DoW's there is no aggressive action. What's the use of being at war when the AI doesn't try to gain from it.

simple:

so that you can stay doing nothing, while they continuously send 1-unit armies to raid your farms until you get annoyed and attack them, wiping them out when they shouldn't have done anything in the first place.