The lockout is so people can't spam a turn and gear up. I don't know of any other MMO that let's you spam a raid first boss to gear people up before you can try 2nd boss. That is the reason for the lockout. If it wasn't there, people would just spam kill turn 6, everyone would get their one or 2 drops, then they'd try turn 7, spam it get their 1 or 2 drops, then turn 8..