Having put in a couple (well, a lot 😜) more hours, I think the road car physics are pretty darn good except for some odd behavior on FR cars on corner exit when putting power down, which nearly everyone here has brought up and rightfully so.
However, the race cars' physics in general are still way dumbed down compared to ACC or iRacing. The GT3 cars (Gr.3) and GT4 (Gr.4) for example are way too stiff and planted on entry and mid corners. No sort of corrections or sliding needed. You just throw them at the corners. It's not just at the limit that the physics are flawed in race cars, even below it there is too much grip or too much stiffness. Even GT3 cars below limit slide a bit, the cars need to be "looser". GT4 cars slide even more and they don't in GT7.
Another annoying aspect of the physics is there is way too much grip when going off track on grass. There should be a far bigger loss in grip when hitting the grass.
I'm not saying the physics are terrible, every sim has its physics flaws. But I have now realized that they are a step or two below the PC sims but it's a shame because the road cars are top notch. It seems PD may have focused far more on the road cars than the race cars? Still, overall, it's great.
I just doubt PD will ever be able to drastically change the physics with an update. Here's hoping...