Not that Catholicism was considered universal, they created their own importance by naming themselves universal.Actually I did not know that Catholicism was once considered universal!
Like a company calling itself World Bank, or World Gym, World Series, or Seattle's Best Coffee, International Juggling Association, or Super Bowl...you create a system and give it a name which implies acceptance by all...
It is actually one issue I have with the concept of a Universal Church, 'who says?' The holier than thou, self agrandizing aspect of it (despite any semblance of reality or intent to defraud)