Daytime running lights have been mandatory on new cars since 2011.
Although they were probably fine on cars in Sweden and Norway where the added visibility is probably necessary, UK drivers still get confused by them.
Also, ISTM, there must still be issues where although they make vehicles more visible, visibility of pedestrians and cyclists is reduced because drivers are only seeing the DRLs of oncoming cars, blanking out pedestrians or bikes in front of them.