This has been a problem with every single Paradox game I have played thus far and continues to be irritating.
Essentially if you are playing as a king of Armenia or something and the king of France owns a couple provinces in Palestine, if that French king ends up at war with the king of Germany and I swoop in and capture those provinces, there isn't a realistic way that France can hang on to those provinces without sending a large army to go and deal with me, but thanks to game mechanics this is unnecessary. Those provinces are his MOST SECURE provinces, much more secure than those nearby his home. He will lose every last province in France before he loses a single one in Palestine. The only way he will ever lose those provinces is to give them to a vassal, then at least people can capture those provinces from that vassal.
The only way around this I can see is if very distant provinces count for much more war-score than close provinces, like 2x their demand value, to emphasize their vulnerability (rather than 1/2 like is currently the case). Far-flung provinces should be a liability, not an enormous asset that prevents you from ever being forced to peace.
Less Distant provinces, say rather distant from your capital but not absurdly far away, should have a warscore value equal to their demand value as they are vulnerable as well. Only close provinces to your capital should have the super-low warscore value of the default value, as capturing provinces near the core of the kingdom can be easily recaptured and should not count for as much.
Also, in terms of "forcing peace", it should only be necessary to capture the capital of a realm to "force" peace, but in order to "force" the peace, the demand should be equal or less than the warscore.
Essentially if you are playing as a king of Armenia or something and the king of France owns a couple provinces in Palestine, if that French king ends up at war with the king of Germany and I swoop in and capture those provinces, there isn't a realistic way that France can hang on to those provinces without sending a large army to go and deal with me, but thanks to game mechanics this is unnecessary. Those provinces are his MOST SECURE provinces, much more secure than those nearby his home. He will lose every last province in France before he loses a single one in Palestine. The only way he will ever lose those provinces is to give them to a vassal, then at least people can capture those provinces from that vassal.
The only way around this I can see is if very distant provinces count for much more war-score than close provinces, like 2x their demand value, to emphasize their vulnerability (rather than 1/2 like is currently the case). Far-flung provinces should be a liability, not an enormous asset that prevents you from ever being forced to peace.
Less Distant provinces, say rather distant from your capital but not absurdly far away, should have a warscore value equal to their demand value as they are vulnerable as well. Only close provinces to your capital should have the super-low warscore value of the default value, as capturing provinces near the core of the kingdom can be easily recaptured and should not count for as much.
Also, in terms of "forcing peace", it should only be necessary to capture the capital of a realm to "force" peace, but in order to "force" the peace, the demand should be equal or less than the warscore.