On the other hand, everyone I know from switzerland goes (usually) to germany to shop there, and our balkan "gastarbaiters" go home, and do "everything" here/there (dentist, haircuts,...).
This is common in border cities such as Basel, but seems relatively unusual in my experience for people living in Zurich, Bern, etc. It's often not worth the extra few hours of travel from these cities on top of potential customs formalities.
Most of our products are kits requiring soldering, and by far the most common cause of failure is user assembly errors. We offer great support trying to assist the customer in fixing any errors, but it is still the customer's fault if they really screw it up - which rarely happens.
All non-trivial parts are 100% tested in the factory, and we explicitly instruct the customer to verify they function before installation. Defects do still happen, but are not very common. We'll just send a replacement without any fuss, because we budgeted for that.
I do not believe long-term warranty requests have ever happened at our company.