Not everybody wants GT to live on the bleeding edge of "realism"
(quoting just one sentence to save space but I completely agree with everything you said)
Thank you! This has been exactly what I've been getting at.
In GT5 there are already so many options to increase the realism, or reduce it.
We have the driving line in the game and nobody seems that bothered because it's so simple to not use it. I fail to see how a rewind feature would act any differently in that sense.
The argument of how rewinding time would make people a worse driver rather than better can be leveled against the driving line as well.
But I'll bet any money, that many more people have benefited from learning from the driving line than those who became worse because of it
(if there even are any of these people, but for the sake of ease let's say they exist)
I'd imagine the same thing will happen with a rewind feature, given that people can attempt a tricky corner multiple times without having to drive all the way back again.
I guess the main thing to take away from this entire thread is
As far as we can work out, it isn't going to effect you negatively and it will be a positive thing for novice drivers.
How is this a bad thing?!