Name one important issue where the EU has reached a satisfactory agreement and results. Free roaming within the EU Standardization of chargers for phones

Name one important issue where the EU has reached a satisfactory agreement and results. Free roaming within the EU Standardization of chargers for phones Free movement (including right to work and study) within most EU member states, plus I)celand, Norway, Switzerland and Liechtenstein Passenger rights for air travellers 75 years of peace I could go on, but get the strong impression that any argument, no matter how persuasive, is just a waste of time, looking at your replies.