I think Banner Balance is a good idea. It allows clans to work together and strategize on how to beat an enemy.
However, if a really good clan with tons of skilled players always fights against Random assorted peasants, people who are not as good, then it will not be as fun for them.
So I think for community, Banner balance is good, but for fairness, sometimes it's not the best. Then again it also pushes those not as good to become better, which is probably the best reason to have it all in the first place, kakakaka