Rockets?

So... I know that rockets used to be banned in PL. Why was that changed? I'm just curious because a cheap, long-distance hand of god attack is out of place in a strategy game that emphasizes unit diversity, positioning, and economics. Yes, I know there are ways to mitigate damage, but they're still OP in some situations, and in this case destroyed my ability to defend myself. So, I'm just looking for the logic.