Paris to Rome can be done with only one stop, for example Utrecht->Milano (transfer in Zurich) can also be done with one stop, and Amsterdam<->Utrecht are only

Paris to Rome can be done with only one stop, for example Utrecht->Milano (transfer in Zurich) can also be done with one stop, and Amsterdam<->Utrecht are only 30 minutes apart and have at least 6 trains per hour. Quite a lot of international trains in NL terminate at Utrecht rather than Amsterdam, I'd imagine because of rail congestion on the leg to Amsterdam. Only Amsterdam<->Berlin and Amsterdam<->Paris are direct links from the capital FAFAIK.