Same here. We're midway through a migration, and this has us re-thinking the whole move. I wonder if we had a duplicate copy of our data in the EU data center if we could do a fallback during US downtime, or if the entire 'cloud' goes down.
Replying to my own comment as I just talked to their support about this: "The maintenance window does affect all our data simultaneously. As we push the updates through one data center to another."
Welp, so much for that.