Uh, it's not that simple. :D (Destiny)

by Xenos , Shores of Time, Friday, November 03, 2017, 11:45 (2656 days ago) @ Robot Chickens

Yeah this is a simple version of what I was going to say. Add on to that that there would basically be a time when the first region upgraded couldn't play with anyone else in the world outside their region.

And then, even further: what happens when maintenance takes longer than expected? Instead of the whole process for upgrading all servers taking a few hours it could take 24-48 hours depending on the unexpected extra time. Not only is that not ideal for international matchmaking but it also makes the server team's job much more arduous.