Aside from what the other commenter said about the hybrid systems, you proudly state that you have 4 cards at minimum, but having a system that would work continent-wide for ~98% of all money you spend would not bootstrap if someone needed to be bothered with having a separate travel card, which would rest in the drawer or as second Apple/Google/Garmin Pay choice most of the time? Most adults I know have 2+ cards already, it's just that they were issued by Master Card or Visa. American Express and Discover still exist, despite definitely not having worldwide coverage.