Also a road car have a brake balance of 70/30 and normally a pretty big amount of "toe in" on the rear tires and this create a lot of balance to the car when braking. Maybe we can call it under steer even, but in the end that feels more stable than anything closer to 50/50 brake balance.
So I don't really feel like the physics are overdone in iRacing, but I would never in my right mind call it similar to real life. But I wouldn't really compare it to real life if my only experience on the track was my private road car
But I like the questions you ask here.
I can confirm that 3 screens helps a lot when it comes to turn in points, and even more on turn out points because you have a more natural view. But distance to the monitor/TV is just as important. If you feel like driving from the back seat you will struggle hitting your turn in points with 1 screen or 5.
Oh and yes I have track experience both in road cars and track cars (you can rent a BMW 3 series on one of the race track in Norway, witch is purpose build for track driving/racing)
(renting that car for a day was super expensive (equal to 5,5 year of iRacing full price), but it included a class to learn about safety and race craft, track walk and a instructor telling you how you should select your driving line etc. Then practice, qualify and a "pretended" race with the other ones. They didn't really allow us to race close.