These are the companies specialized third parties who are in the business to put you behind the wheel and in control of your car.
Physical disruption guarantees are just suitable for cars that do not have right to wear protection.
Then you need to check each specific car you want with Carfax or another reporting service.
You can get an extended warranty replacement on your car and get a much better deal than the concession and also get better coverage as well.
You know that when you buy a new car, it comes with a guarantee - used cars often do, too.
Their concerns are not unfounded as many cars have such problems after the expiration of the specific period after the car gets a little older.