Let's just give it a rest... Handling-wise, if it's drifty or grippy, what does it REALLY matter? As long as everyone is on the same playing field, well, you think that drivers don't have to adjust to a new level of grip going from say GT cars to F1, or rally to Australian V8 Supercars? It's just ONE thing you have to adjust to, but as long as EVERYONE racing deals with the same issues, it's still 'racing', isn't it?
No, the thing that utterly destroys Shift as a 'sim' is the complete lack of any mechanism in the game to penalize bashing and anti-social behavior. As long as we are ALL 'racing', it's just a great game, to be honest FAR more viscerally exciting than any other GAME (yes, it's still just a video game, boys and girls!) I've played so far. But mix in the Burnout Paradise weenies and the Mario Kart kids, and no amount of sim-like handling accuracy is going to make it anything other than what it already IS. A bashfest.
Put the same contact rules in whatever your favorite handling sim is, and you will still have a demoralizing game to play, once a few idiots sign in. The TRUE sim's strengths come not from the accuracy of handling, but the accuracy of damage to those who aren't even TRYING to race, and the ease with which the real 'racers' can boot them and get back to the race..!