I do think that at times kingdoms will add provinces to aid in a war, especially early age. But when looking at any change like this you have to look at both sides of the ledger. Sure disallowing provinces added during war would prevent folks from utilizing this strategy -- which is at least a little unfair -- BUT this also makes it more annoying and harder for lower tier kingdoms to add provinces and players that they desperately need. Maybe someone wants to join NOW and if you have to wait until the war is over you lose that player? Not great and IMO the harm in this change would outweigh the benefit. Lets not make it harder to start playing, the 72 hour protection window in war is enough to mitigate abuse.