For whatever reason, when a car is in your draft, you will experience a lack handling and braking abilities. Braking distances are longer, turn in isn’t as sharp and traction is terrible.
The higher the downforce of the cars you are racing, the more this affects you to the point where in high downforce prototype cars, it can auto spin you. This was a bigger issue at launch and was mostly fixed but it still remains and artificially affects racing and makes it hard to leave behind a car you have just overtaken because you now experience less grip than the car behind.
This is incredibly infuriating. Please get rid of this unrealistic feature that artificially keeps racing close.