I think the dev does them. The race_s setups aren't good enough to be used during racing - They're just an 'okish' platform to start from.
It's probably setup for ease of driving, rather than grip or something. Who knows, maybe the Scirocco will have no adjustable setups apart from tyre pressures etc, as part of the VW licence agreement. I hope not, though.
It is not due to physics changes, it's because the setup changed somehow... you just needed to rename them and they were just fine iirc. There have been tiny changes to physics since BF1, maybe the GTRs are the only ones that have changed enough for the setups being a bit bad to drive.
For race_s, you just need to rename them and they are just as fine as they were back then when they were released.
"Roll cages are just for the look" - sure, but then so is the entire car and driver really, there are no functional mechanical visible parts apart from the tyres. It's about authenticity, who needs a fire extinguisher modelled on the floor of a GTR?
I don't go along with the trackday racer thing. Who shows up to a trackday with 20 identical other cars, all with exactly the same after-factory parts (but no cages, aesthetically they're stock), exactly the same power and weight and tyres, for a fun, unorganised race with no rules, and then proceed to form up on the grid and use the start-lights to begin their trackday session? Everything shouts spec-series, except the model, which is just odd.
Stick cages in the current road cars, it doesn't mean you have to run them on slicks or anything. It's easy to find technical regulations for classes running similar cars to copy. If a series' regulations allow the diff to be changed then fine, if the suspension is replaced with X brand adjustables with x ranges of adjustment, then make that the case too.
So in answer to your question: I want race cars. F'rinstance I want XFG and XRG to be part of the "Junior GT" class, or something, and constrained by the regulations of that class. They'd be race prepared cars which are balanced and scrutineered by the series organisers, such as those you might find in a multitude of championships irl. The parts allowed by those regulations would determine the scope of adjustment on the car.
I have all of them renamed. well... I can drive them, but that's not the point. They are still slow (that's not a problem really for the purpose of all round sets) and they do not have nice handling characteristics. (trying to put it in a nice way).
Usually the suspension on them is excessively stiff.
For me race S setups need to be just a little stiffer than the hard track setups, in order to have mild handling characteristics.
They will still be slow… but much easier to handle for someone who needs just to drive a combo for the firs time without having to download a setup
Maybe I should stop talking and start making an easy to handle setup pack myself. This isn’t going to happen till next year though because right now I don’t have my “able to run LFS” PC.