Stores were closed on Sundays, things closed earlier in the evenings.. We survived, we planned ahead..
Now everything is open all the time. Malls are open on Christmas day, even on New Year's Day!
When do people have time to spend time together, to relax, to not be consumers but be people?
I kind of wish stores were still closed on Sundays..
As a traveler, Germany on Sundays simply sucks.
International travellers tend to arrive by plane or train (as Derbasti says), you can buy something from there. Or from a restaurant.
The only problem you would have is with supermarkets away from the train station or airport.
I asked my hotelier about it and he just shrugged and told me where to get some kebab three towns over.
In Dublin they open on Sunday, but close at 6pm on weekdays