Honestly, it's the same as shared blame penalties but I'd wager they'd clean things up a lot quicker than penalties would. A pit stop repairs the damage, that's how heavy damage works now. People get sent to the back of the grid, they lose their advantage gained by using other people as guide rails. Honestly, right now the penalty system incentives bad behavior and often penalized the victim. I've had too many races ruined by others people bad driving to count, as it is. I've been hit so hard that I've lost 20+ sec before. At least this way they are forced to learn or never improve their ratings.