What is wrong with farming kills? It's PvP. It is a good thing you can win via multiple methods, it makes things far more interesting than if you were just restricted to one win condition.

Battle highs aren't some sort of instant win condition either, with a little bit of teamwork with your party you can deal with battle highs, it's not nearly as overpowered as some of you people make it seem. The thing is though if your party is getting farmed that had to have started before anyone had battle high, and battle high or not you never had a chance.