I personally think that the tyre wear is modelled effectively well. After all these cars used cross ply tyres that were probably standard issue road tyres. If you watch footage from the fifties, and there is some good stuff at Goodwood
the cars would pit very often for tyres but not for fuel.
Yes, I'm not saying it's modeled wrong, it seems realistic. Perhaps it was my setup, but also my driving, so I don't know. It's interesting to have tire wear as a factor though, more here than in the other mods we run.