Yes, it is easy to find something else to do during the maintenance and make plans for something else.
However, if you are really an adult you will also realize that adults will often have schedules that are not very flexible. While it may be easy to find something else to do, it may be very difficult to find the time to play some other day. Not everyone is a college kid with flexible schedules.
To everyone who likes whining about how people should be at work or school, consider this: School days often end up at 14 or 15. Maintenance ends at 18. That's at least 3 hours of lost game time for school kids, more if maintenace gets extended.
Work days often end at 16. That's at least an hour, maybe more. Some people work earlier shifts or nights, which increases the time again. And if this continues, it will be EVERY SINGLE TUESDAY. Europeans are clearly getting less for the service. And they are paying more.
I really can't understand why they just refuse to do separate maintenances for US and EU servers. It must be some kind of a technical issue they have been unable to solve, they wouldn't do something that stupid otherwise. Please BioWare, try to solve those issues and fix this. Yes for separate maintenances!