...This already happens.
Not when you recruit them into a unit, but when they become available in the recruitment center.
This has been the case for...I don't even know, maybe a decade?
Also, I'm already working on changes that make "going after enemy population" a less viable strategy, because that leads to regions that take RL months to years to become productive, and that's no fun.
I also have some other ideas about how to make keeping your army alive a very important part of your strategy.
