Except you'd be bringing it down in the middle of the day for all of Europe if you did that. The times they've been picking to bring servers down correspond with when they're at their lowest worldwide.
I'm personally I'm of the opinion the EU servers should have their own patch time, because you're going to have unhappy people no matter what time you do it with a globally synced maintenance. I can also see how doing it this way is much simpler while the game is new. If something major needs work you can fix all the servers at once rather than having to stagger patches throughout the day.
That in mind, I'm hoping in a few months when all the major kinks have been worked out they go into individual patch times, as I'm also one of the people that plays later in the night usually, and having the servers go down at 2am CST feels kinda odd.