Handling the launch and handling the maintenance are two different things. As I see it, BW tries to have their most experienced and best people available for launch and they can't be up 24/7 or there would be a lot of mistakes. Therefore waves come in USA and Europe at the same time, so that those best people can handle any problems.
If BE EU would start to give out waves in our timezone and something problematic would happen, they would need to contact main office in Austin and try to get those specialists up from their sleep. This would then most likely mean closed servers, delays and everybody stressed and unhappy.
In my opinion current way to do things seems to be very good and so far has been mostly problem free. I expect myself to get in maybe friday (entered code 13.11.) and I'd rather play on the servers that work and don't have thousands of people killing same moose/mice/rats etc.
Happy waiting to everyone still out there...