I doubt this system will ever go away outside of standalone-DLC or other equally major release, so here is a suggestion of small change that could feasibly be patched in.

Instead of Capture point deciding the battle, make it buff the morale of the controlling army (similar to how those capture points worked in Shogun 2). So the capture point in center of the map just represents that your army is taking dominating posture by holding central position. If this is done without opposition, you can imagine that they are basically jeering the opponents as cowards, etc. and have boosted morale for those reasons. If this is achieved despite opposition, well that's pretty much self explanatory.