I think they wanted to start Dragon power level high and leave room to adjust downward if needed. They wanted it to be a big exciting event and make a splash in the meta. If everyone just shrugged and said "These dragons are weak I'm gonna keep playing demons" it woulda been a flop. It'll take a week or two for people to get bored of the new dragons and the meta to settle (and from what I'm seeing Demons are still the generally a winning strat despite dragon power level if only because everyone is trying to force dragons, so demons are easier to draft), by which time Team 5 will come in with a series of balance adjustments to shake things up again.