Wow, there are a lot of people in here swinging for fences that don't exist. I, for one, am very much liking what I'm seeing and feeling in the update.
I feel like most tire models have been thoroughly updated. All comforts seem to be grippier than before, not feeling like old hard tires, and while they are still prone to early traction loss, that area between slip and grip is so much more malleable and controlled. I went back to the Viper drift challenge at Daytona and it would want to understeer with throttle on corner entry on CS! When you got the balance right though, you could hold lurid, long, 4th gear entry slides and recover them without a crazy amount of input (still a LOT of wheel movement though). Something I don't think I could have done before. I was able to re-gold it on wheel when before I resorted to the controller for drift missions. If I had a dedicated e-brake it would have been much easier.
Sports tires don't seen like they've gained much static grip, but they have definitely gained the some of the same good traits beyond traction, where the tires are much more pliable and linear in their release/gaining grip, and playing with the chassis or intentionally drifting is so much closer to real life levels modulation and recoverability. i.e. now you can catch and slide things!
Racing slicks feel as if they are much more rigid in their sidewalls, and transitionally grippy in that they "snap" more, and beyond traction they can be less forgiving, but in a way that is fitting for a full face slick tire on tarmac whereas I feel earlier it was way too easy to slide on slicks, and the recovery was too smooth in comparison to what would happen in real life situations.
The R8 LMS is greatly tamed down, still exhibiting a lot of lift-throttle oversteer, but it is much more manageable, the power on sensitivity is all but gone, and the car is really planted in almost all areas where is wasn't before. It's a MUCH better car now.
Same goes for the BMW M6 Gr3, very much more planted and stable, especially on throttle. The CE should be a little less intimidating for those who haven't finished it yet!
Braking also seems to be greatly improved as most cars no longer exhibit that nervousness on braking where a lot of steering input was need to keep some cars straight on the binders.
All in all, all the cars and setups I've tried so far benefit from this update as far as compliance and grip, with the only downside being that a lot of my cars need some re-tuning to exploit the new found pliability.
There was a moment where I went "WOW" in the F430 coming out of the last corner at Tsukuba where I goosed it while it was loaded up mid corner, pitching it into oversteer, corrected, dropped throttle to let it come back under me, goosed it again while the car was straightening out, and the tires continued spinning until they gripped up! Something that would not have happened under the last physics model. Previously any wheel spin without the car being perfectly balanced would have pitched in into oversteer again. This allowed for the gradual regaining of forward traction as it transitions back from lateral traction loss. This is SO MUCH more like reality than before, and so welcome. This was my AHA moment when I knew we were in for good things!
This is after only playing an hour or so, and there's lots more to suss out, but I for one am loving this new physics remodel, and hope that it allows some that were struggling before to have better groundwork to polish up their skills.
To those that are still complaining, who knows what you want. This is getting pretty dang good.