Think about what you said here for a moment. It's true: military ideas ARE suboptimal for WC runs. But what sort of run has more warfare in it than any other? What run is, in fact, an almost constant series of battles and sieges? A WC run. And in a warfare focused campaign, military ideas are a bad pick. If the whole military category is suboptimal when you're fighting constantly, that is a clear indication that its ideas (whose primary reason for existence is to help you fight) are underpowered. The payoff for taking them is so low that even in a WC, they aren't worth it. They need buffs, not nerfs. Perhaps Quantity needs fewer buffs than the rest, but they all need improvement.
BTW, my last WC was 5+ years ago, and I plan to never do another. The tedium and boredom are far too great, the fun minimal. I'm not part of the "meta min-max WC" crowd at all. But that doesn't change my opinion about military ideas.