Force feedback is not physics. Physics is about handling behaviors, the tire model, oversteer and understeer, things that are measurable and repeatable. Force feedback is an element of the user interface with the game, and greatly depends upon the wheel you're using and your FFB settings, making it a terribly inconsistent measure of a sim.
I visited California one summer, and something that stood out to me was how so much of the grass was brown and dry. So the green-ness of Laguna Seca surely depends on the season and weather.