So if, under your proposed change, you can still heavily damage a region to the point that it's a burden on your enemy (low production and therefore small harvests, but still a relatively large population), how will this encourage people to do takeovers rather than looting?
Because as has been pointed out it is relatively easy to repair regions if you're uninterrupted. You can temporarily deny their use to the enemy by looting them, but if you wish to truly do lasting damage you need to take them. However, the current mechanics mean that you can just deny their use by removing them from the enemy realm altogether. Put another way, its a matter of the temporal nature of war. Looting should be more tactical, not more strategic. As it stands people are devoting entire strategies around loot the other guy's regions till they're mostly all rogue and he capitulates. Not take those regions by force from the outset, and loot regions where it makes tactical sense to do so.
