Oh. This old discussion
Well, might as well give my opinion here again. As a WMD member i test the builds from time to time to see the progress.
To me it is clear that the focus of pCars is different than "sims" like rF2.
Let us take a comparison from FPS:
The new Wolfenstein game is a pure arcade game with fast, relentless action
Battlefield 4 is a "semi-real" shooter that "feels" realistic but is emphasized towards multiplayer and pretty visuals with rapid action
ARMA with ACE is the harcore realistic option, where you can stare at a tree for 3 hours waiting for an event to happen in real time, only to die of a shrapnel 5 seconds later, with MP focused on coop in large massive scenarios, often mimicking real world politics
And in the racing world this would equate to Wolfenstien being the "pure" arcade racers.
I would view pCars in the same vein as Gran Turismo and Forza, all belonging to the Battlefield 4 category. They "feel" real, but are simplified and streamlined for the purpose of action and mainstream sales.
Then you have the racing equivalents of ARMA such as rF2 and to some extent AC. Products where mainstream sales are important but not more important than accurate simulation down to miniscule details. This is a subcategory only attracting a few select users, however very vocal ones. In these products it would be as hard to "drive" a formula car as it is in real life, meaning hours upon hours of practice and actual real life skill is needed to even be remotely ok at it.
Belonging to the "semi real" category as i think pCars does is however not really a bad thing OUTSIDE of this place. There is a reason why ARMA can not rival the sales of BF4... Accessibility is king, if you want the console market as well, which pCars does.
So it really is comparing the wrong way... All product categories are good, and i will definitely enjoy pCars when it's done, but not for the same reasons i enjoy the deeper and more nuanced experience of something like rF2, with it's relentless focus on detail simulation.