Well, I don't understand what's there to check, I never said Netherlands wasn't in EU.
The most probable reason why you can't get packages from EU Amazon to Switzerland is because they are not in EU.
The same reason applies to why you can't get packages to EU if you're trying to get them from US.
Yes, some big sellers don't mind but small ones do, and EU Amazon does have a huge variety of sellers.
For example, I've lived in Croatia before and after EU membership. The Amazon situation changed completely and now I can get packages from any EU Amazon.
The most probable reason why you can't get packages from EU Amazon to Switzerland is because they are not in EU.
The same reason applies to why you can't get packages to EU if you're trying to get them from US.
Yes, some big sellers don't mind but small ones do, and EU Amazon does have a huge variety of sellers.
For example, I've lived in Croatia before and after EU membership. The Amazon situation changed completely and now I can get packages from any EU Amazon.