As I've said before: no they aren't.
Skidmarks are one of the few visual elements left to include that can help us better our driving experience. Seeing that all important mark of rubber on a track is all that is needed to tell us if we're heading to a clean finish or total disaster. Not only that, but if PD was smart about it, they'd also include the added grip to the texture, making them even more inclusive in our racing lines.
So please, stop saying stuff like this is useless.
I'll give you the added grip of the marks (and with that added, visuals should also be added), but other than that they do nothing for me. I don't mind you having a difference of opinion, but I can't follow your train of thought.
"Seeing that all important mark of rubber on a track is all that is needed to tell us if we're heading to a clean finish or total disaster."
Why? I can already tell, I won't see my own skidmarks from inside my car, and I won't need them when using chase cam.
Anyone who says skidmarks are a waste of time, consider the fact that VIDEO GAMES are a waste of time. Everything besides having 3D rectangles on wheels and a curvy 2D track is a WASTE OF TIME. What is the point of the car models? They don't do anything except look pretty and reflect USELESS backgrounds of trees and walls.
Skidmarks add to the game, one way or another.
You want bare bones driving and racing experience go play Top Gear for NES
I understand that you're being sarcastic, but I agree. Graphics are of minimal importance. They are a distraction in modern games and a waste of resources.
One example, the following game from 1994, USNF 94
http://www.youtube.com/watch?v=lgg2SI17Vpo
is better than any modern console flight game. It has nothing to do with graphics. Likewise GT1 is better than games like Need for Speed Most Wanted or Grid.
IMO, The only purpose of high end graphics [in GT] is to let you drive properly, ie you need to see the track and the other cars, and what they are doing.
If Top Gear has better physics than GT, it's probably a better game, unless it looks so bad that I can't properly drive.