Good FFB has always been and will always been synonymous with good physics. If FFB is good physics has a great chance of being good too. Although in some cases FFB can be good, but physics just might not be of what they should be. Simracers should always be aware and catch things that might not be true, not just things that might not be feeling right.
Right now people doesn't really talk about rF2 anymore, as if there would have been some silent agreement. But some years ago rF2 has been mentioned over and over again for its great FFB. But people doesn't mention great physics, although it is the reason why FFB is good.
For example. Did you know that tire flex has significant role for geometry. All the instantaneous roll centers, and pitch centers shift as tire contact patch deforms to every direction. Simulations such as AMS1 or AC might be more handy for some people to plug in some more traditional data they can get and achieve "wow correlation wowzers". But rF2 is simulating what is happening truly, therefore exact to reality effects are much more likely to be recreated in such simulation. There is so much nuance that is possible to apply to tires, it is complex and difficult at first, and for purely data driven guys with 0 senses it is probably impossible to work with, but guys who can feel and has some sort of understanding it is possible achieve very satisfying and very realistic results with rF2 tires. Also very important is chassis flex, it helps greatly to make car feel alive and more "itself", you can mess up more with all these options availbale too obviously.
Force feedback works in a loop with what the simulation is factually doing. The forces at the steering wheel are just torques. When they go together properly with what you see on the screen (depends on computer performance and how fresh you are), when you try to make the car do something (depends on your skills), and when car responds good to that with a pinch of its own character as it can be expected (depends on what you know about the car), then it feels good and right. Loop closes.
In the past Sderenno released the car almost entirelly on the Lola T70 physics. People were very happy about the physics. That happened.