In the original Birthright rules, the vast majority of rulers were fighters.

In the dark and middle ages, the vast majority of rulers were fighters.

Going to a skills-based system as the community choose to do in 3.5 resulted in fighters being a poor choice as regents compared to Nobles or maybe even Rogues.

I believe a class-based system restores the balance to fighters, a generally low-skill class. I believe the balance should favor fighters so as to reflect the Birthright setting as officially published and what we know of medieval history.

(Fighter is an inclusive term to represent strong guys in heavy armor who boss others around through force of arms)