Nah, I'm Going To Do What I Want

Even if he possessed Limit Affinities for five different Primary Elements, there was simply no way the Crown Prince could advance so many levels in a meagre few years. In fact, it was less likely for him to accomplish this feat with so many Primary Element Affinities, for the difficulty of cultivating exponentially increased when you had to gather Magicules to support five Primary Elements.

In essence, a Multi-Elemental Mage had only two paths, one of which would waste all potential.

The First Path: prioritize one of the Primary Elements, neglecting all the others you had an Affinity for.

This choice, although superficial and not much different from if you were a single Element Mage, guaranteed that you'd breeze through cultivation realms.