note that Europe ≠ EU, for example in Switzerland we still have roaming when going to the EU
and it seems like that the UK will lose it's connection to this no roaming cost club, post brexit :(
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.
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!
Years ago, roaming data had unavoidable exorbitant fees in almost all cases. Over the past few years, most people who travel outside their home area can trivially obtain cheap data so long as they plan ahead and set the data plan appropriately. I don't have a citation but it's been my personal experience and that of the dozens of commenters in the linked issue.