I'm not the biggest fan of iracing, I let my subscription run out after trying GSC 2012 and rFactor 2, iracing felt much too dull after playing those 2, especially RF2, but in it's defense, I don't know what u mean by rf2 and iracing are difficulty sims, and that you therefor compare pcars to Netkar and GSC. If anything, rf2 and iracing should be compared to Netkar and GSC as those 4 are clearly all prosims where as pcars is total simcade.
Also, to the people saying there is nothing wrong with the ffb in project cars and stuff like that, well just because a game is simcade doesn't mean it has to have messed up ffb and physics issues, after all, some cars in forza and gt5 have good ffb as well, doesn't mean they are hardcore sims, just means the developers did a good job with the ffb.
Simcade doesn't mean there are ffb issues and retarded physics characteristics, it just means the physics are overall more simplified and basic, not as dynamic, which can also mean there is not enough variation of car characteristics and overall handling dynamics relative to what's goin on with the throttle, brake, steering inputs, what's going on with the constantly changing loads from corner to corner of the vehicle mass, how the tiny changes in ride height are constantly affecting the physics and tyres etc. etc. etc. etc
The physics, even with this first version of this new tyre model are better, but still feel wayyy too dull and boring (just fine for a regular racing game but not even remotely close to actual true sims). It's so easy to just repeat the way you do a corner lap after lap, without any variation in handling or corrections for eg. under braking, turn-in, entry, mid corner, etc etc. It suprisingly still feels like there are some kind of hardcoded aids on in the background, even when you have them set all off. It feels like there's some kind of secret aid that helps you just a tiny bit with your steering and your line, just a little bit.
Now the game is still fun of course, but I can have fun battling at Suzuka with Ferrari Enzos and Lamborghinis in forza or granturismo, having a fun time driving, and sweating, and feeling the pressure, and getting immersed into the racing experience, and having awesome battles, has nothing to do with how prosim/sim or simcade or arcade a game is, as you can have that experience with all 3 genres (especially the first 2).
So I'm glad you had an awesome time battling with the zondas at spa, having a game's experience put a smile on your face is one of the most important things
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