I see your point and its valid. For I am a casual GT fan. I get tired of having to go back and fine tune stuff that I don't really know much about. I have been with GT since the first installment. Each game the physics improve so you can't simply do exactly as you did before. I think the option to save setups like in GT5P is perfect. If one setting is screwed not all is lost. Why they didn't repeat for GT5 is beyond me. Every track is different and every car is different.
For example, while playing F1 2010, you pretty much have to set up your car slightly different for each track. GT5 is a different racer but its still a racing simulator in which would require tweaks for each to try to get the best times possible. A setup for Nurburgring will differ from High Speed Ring for example. Take the complex strand from the earlier GT and it will differ from the Top Speed course. They need to include different levels of tuning for all levels of racers. Novice, Intermediate, Advanced, and Expert for example. Lower ends levels can give you recommendations and presets. Higher ends gives you noting and let you go at it yourself. The goal would be to have the lower level gamers work their way up to the comfort level of the more advanced racers.
Be very careful, in this forum you have to scream "pro polyphony", anything else is just a pre cursor to getting flamed..5...4...3..2..1...these people lived in the cave and didn't want to move out