It's a must? really?
I never understood why so many people get so worked up about something as trivial as clone helmets. I get that it doesn't make sence that they're not waring their helmets when they're in battle, but neither does 2 teams standing in front of eachother, taking turns to take eachothet out, or blaster fire being able to defeat anyone using a light saber. So yea...
Anway, @YaeVizsla is right. It was probably even more than 6 months ago that the devs made that statement.
PS. i think rex is one of the coolest looking characters ingame and his helmet is fugly ;)