More like it would make it too difficulty for them to balance jobs, creating the neverending complaint stream about balance.
One of these days, MMORPG developers need to face the underlying problem: they're trying to create jobs as if they're making a competitive game instead of a RPG. Balance shouldn't be a consideration in a RPG.
Those who are competitive by nature can restrict themselves to the FotM jobs that the theorycrafters have decided are the best for the latest content release and switch when something else ends up FotM the next release.
Those who are more interested in the RPG aspects can pick what they have fun playing.