One immersion breaking issue for me is how tight the race pack tends be, and how artifically the tightness is preserved. I.e. I've just completed a 20minutes race on Red Bull ring, in Mazdas, end even after that time, the race pack was basically one big snake with exact same pace. The most glaring issue is how the pace changes, for any car, if it falls behind the pack, i.e. because of a spin. Suddenly the AI is able to drive even 2 second faster than the lead car, doesn't matter if the car was previously 3rd or 23rd... as soon as any car falls behind, it magically becomes the fastest car on the track, by an insane margin. Until it catches the pack... then the pace dissapears and it is back to the general pack pace. In addition to be very immersion breaking, it also means that it is very hard to have meaningful fights outside of the main pack. Becasue all of the cars suddenly gain 2+seconds on pace, and leave you in the dust.