I will say it again... having a rewind button does not make you use the rewind button... being the kind of person who uses the rewind button makes you use the rewind button.
If you don't like the idea of rewind and it ruins the game for you, you won't use it and nothing will change. If you find it beneficial, you will use it.
Having played quite a few games with rewind, I can honestly say it did not in any way ruin the games for me, it just gave the option to remove some really annoying parts (ie taking yourself out of the running late in a long race). Basically at the point I would have otherwise "pause/restart" I now rewind. I didn't restart before for every littel problem and I don't rewind for every little problem either.
It takes away none of the challenge that restarting didnt, it just takes away the a lot of annoying monotony.
When you are under pressure you are trying harder to get everything perfect, a rewing button would, without a doubt be a load of your mind. Its not teaching you how to drive its letting you have another go.
If I knew I could just retake a corner, why would I bother putting the effort in.
Yeah it aint hardcore when theres options like that.
How did you learn to drive better without rewind? You tried, screwed up, learned, adjusted, retried, repeate until you got it right.
Rewind does the same thing. If you never learn how to drive, rewind won't help, you will just end up rewinding into the same mistake over and over until you do learn how to drive.
Rewind is like being able to restart a race but better because it lets you learn a bit at a time at specifically whatever part you are having trouble with.
It seems that people are afraid this is somehow going to let people cheat or devalue your experience somehow...
First off leaderboard scores with rewind should obviously be noted as such but otherwise there is no effect on your game if someone else chooses to use rewind.
When it comes time to compete, it will be your skill against theirs, rewind won't play apart. What they do alone in their own single player games, what does that matter to you?
Driving assists and driving lines aren't exactly hardcore either... when is the last time you saw a racetrack with dynamic colored lines on it? It doesn't make the game worse, it makes the game more accessible to those who need it and makes the game more fun for those who feel using it is fun. For those who don't like it, it doesn't do anything to the game becuase you don't have to use it.