I've been thinking about the idea groups and how many are opposed to others, and military ideas are the most blatant here, falling into three sets of conflicting ideas (which, as I understand, were governed by sliders in EU III) - Plutocracy and Aristocratic, Offensive and Defensive, and Quality and Quantity. As it stands, you can easily take a pair of these opposing ideas with no penalties, despite the fact that one would think that such focuses would increase the risk of internal tensions and be hard to maintain, rather than easier, as it is now, with taking certain sets of opposed idea groups (particularly Quality and Quantity) removing a great deal of bad events from both. For example, take the "Offense or Defense" event. It might make sense to greatly reduce its likelihood if you only have Offensive XOR Defensive, but perhaps it should be much more likely if you have both.
It should be harder to maintain an army that is both huge and well-disciplined, not easier. One idea group is focused largely on your troops being expendable, and the other, on them NOT being expendable, and instead, on their individual competence. There should be events that bring up the conflicts that might exist between such opposed ideas. Having both Plutocratic and Aristocratic should put your nobles and burghers in conflict, having Offensive and Defensive should create opposed camps of officers, each pushing one or the other, having Quality and Quantity should be very expensive and carry with it many similar conflicts to Offensive vs Defensive.
It should be harder to maintain an army that is both huge and well-disciplined, not easier. One idea group is focused largely on your troops being expendable, and the other, on them NOT being expendable, and instead, on their individual competence. There should be events that bring up the conflicts that might exist between such opposed ideas. Having both Plutocratic and Aristocratic should put your nobles and burghers in conflict, having Offensive and Defensive should create opposed camps of officers, each pushing one or the other, having Quality and Quantity should be very expensive and carry with it many similar conflicts to Offensive vs Defensive.