I love the idea of all being in same conf. But the Big Problem is there is lots riding on winning the scoring between us. And we have the best chance by all picking the teams we want best. In same conf you will have an unequity of different strengths of teams , even among long time AI teams. So , some of us would start with big advantage.
Less of a starting advantage if we have the larger pool of All d3 to choose from.
So to me, playing only OOC makes more sense. Willing to go with majority's rule though.