Why hasn't the Flash event bug been fixed?

The only real issue with the requirements for the bonus tier was how they were communicated to us by the devs. It is clear as day now that you were never intended to be able to use your own Chopper for the bonus tier. If you go back to the original thread pointing out the bug, the one where the dev said that this was an "edge case," you'll see that the issue he was addressing was that the player was able to enter the event without Sabine at 5* and then got kicked with a message saying he didn't meet the requirements. He should have never been able to enter it at all, which is what the dev was saying. The dev's response was horribly and vaguely written so that we had no idea whether he was saying the player should have been able to use his own Chopper or whether he shouldn't have been able to enter. We now know what he meant based on how they fixed the issue.

Now everyone is up in arms about the fix because they think they were simply changing the event to match the bug, but that is not at all what they were doing. They always intended for you to need her at 5*, and that Chopper would be given to you as an event character. I do blame CG for the miscommunication though - they didn't make it clear in the original description that you needed Sabine. They did a horrible job of making that clear to everyone, but everything is working as intended now.