Think about an osw. If one clan really doesn't want to fight but doesn't want to give in, they could declare war on another one of their clans and couldn't be hit by the clan they offended
You should never be hitting someone outside of war. Lol. Self pin on the other side if anything to bring there troops down
But either way. I highly doubt that would change the mechanics of system war enough to make them more prevalent
This is what devs had in mind when selling mithril.. HECK NO u won't reduce the stats when I use MY mithril?!?