Spain also has a nice class at the moment. They have had bad years since the last time they became European and World champions. 2008-2010-2012, all became champions. They didn't show much after that. So in that respect it is nice for Spain to win another title. Croatia was close, but again no gold won. It must be frustrating somehow if you've been close to it a few times. But many players are not happy at all playing this Nations League tournament.
Yes, probably many national teams do not consider this tournament as important as the World Cup or the European Cup. The UEFA Nations League was created to replace the friendly matches which were never taken seriously. That's probably why sensations like Luxembourg's win against Bosnia can happen. But all the same, I believe that this cup format motivates the countries to play good football.