Not at all: the limiting class system demands that people pick from a set of skills that are, within the game system, perceived as related to that "class".

Whereas, a entirely skills-based system, lets people pick and develop skills that they somehow have access to (and of course, a truly well-designed game system makes gaining access to some skills that a player wants part of the adventuring) regardless of a pre-conceived "class".

__________________
On the kinkometer, my kink measures as a sine wave.