But how can "Wizards" be broken in a Classless System?

Wizards are predisposed to take advantage of a "loophole" in the system.

That "loophole" being that a single stat is what 5 separate ability lists depend on. In this case Intelligence.

By level 8 I was 2 in Aero, Hydro, Pyro, Geo, and Witcho. This gave me access to five spells from each school. I only selected those that really shined and ignored the rest.

My Knight was a spectactor through most of my leveling. In the end I killed them and just wandered around trying to collect ever increasingly large numbers of citizens to slay.

Something must be done.