GREAT piece. Great points, as well.
As a bit of a related aside, my absolute favorite genre of games, racing sims, is vitally dependent on vibrant, active modding communities. Indeed, a sim like rFactor (and, soon, its sequel rFactor 2), is designed as a platform for modders to work their magic. There are hundreds, maybe even more, of modding communities and individuals worldwide who add so much replay value to what is essentially a very basic game right out of the box.
I honestly wish I had the expertise and the time to create my own mods, especially for rFactor.
These mods are precisely why I LOVE racing simulation games on the PC, and why I just laugh at all the people who believe (mistakenly, in all honesty) that "games" such as Gran Turismo and Forza are realistic. As someone who used to be an honest-to-goodness part-time test driver, console racing games are vastly inferior to what a good PC racing sim can do as far as simulating vehicle behavior and dynamics.
Thanks for the brilliant article!