I hate it when I forget that I am outside of the EU and get a 100$ roaming bill for net usage by just stepping out of the airport. Then I get the overuse alert from my telco and turn off roaming.
EU citizens request the native support of "EU roaming" in the phone's OS!
True, but if you're often in EU (that thing completely surrounding Switzerland) you can use one sim to roam in every EU country. So if you are from Luxembourg and regularly visit Belgium, Germany, and France you also get advantages. Much more than a German from Berlin who regularly visits Hamburg, Frankfurt, and Munich.
EU citizens request the native support of "EU roaming" in the phone's OS!