When you think about it it doesn't actually require you to do much on the battlescreen. Not yet anyway. Besides Kurohime's events (which were interesting btw) and the supported skills, there's nothing you can gain or lose from the overview map. I feel that it's actually adding a lot to the game, if you want to experience it. If not, there's nothing forcing you at all. Just like the card system, another slightly pointless but interesting activity.
You do have a point on advisors tho, it would be nice if there were a research that enables you to train soldiers/ collect resources for you. I imagine it would make your stay in the overview map even shorter but it's convenient.