The FAA often just prescribes meaningless total-time requirements until you're entitled to a certain certificate. What they fail to do is mandate any type of flying under which most of those hours are acquired. THAT is what pisses me off.
Think about it. You need 250TT to get your commercial. So lets say you have your private and your instrument, but still need another 130 hours toward your commercial. Why should you have to spend 10K renting airplanes to acquire these hours, when in the eyes of the FAA, you could legally spend the next 130 hours flying straight and level in clear/million, all the while learning ABSOLUETLY NOTHING. Hell, I've heard stories of guys making every landing a full-stop and back-taxi simply so they can legally log all this time spent ON THE F*CKING GROUND! To me, that's just as bad as padding.
Yeah, well, guess what? If I'm working towards a commercial, I'll be sure to fly only on long XC flights, in IFR conditions, and only into busy class-B airspaces. That way I can simply multiply my hours by two, since I'm getting twice the experience as these retards flying in circles around the pattern gaining NOTHING for the experience!