I agree, the trouble with the old system was if you didn't RD on the big rides, you might not even be in the same park come your FP time.
Sure, if you pocketed FPs and make use of the lack of care WDW had regarding return times, you could make great use of using expired FPs in the peak times, but I guess, as a girl scout leader, where being "honest and fair" is something we pledge every meeting, the idea of using a loophole in a system to get more rides in front of my daughter (and on our trip in 2010) one of our troop members, just felt like an afront to the system we were teaching them.
But then, we were never an Objectivist family...John Gault was never one of our heroes...our personal satisfaction at the discomfort of other people, never gave us a person feeling of "victory" and so never made use of the FP- the same way many others have.