Twowolves
Explorer
Pathfinder is doing this as a bandaid over the bullet wound of Overloaded full-caster-level PRCs in previous D20 splat. Since part of the design goal is compatibility with previously released material, incentives to prevent jumping ship are a easily added to the base class. It's not optimum, but given that there are PRCs designed for those who are willing to chop off their ownfor more power, addressing the issue was needed.
You mean like this:
Head of Vecna@Everything2.com