That’s all well & good, but a breakdown getting close to happening my not show itself at that inspection. If you buy the extended warranty then you are covered if that breakdown takes a year to actually happen. Your repairs are being paid for in your monthly payment.
It’s all about preventing 80% of the problems for 20% of the cost. But I think you will prevent 90% of the problems paying a mechanic to look at the vehicle on the lot and then, if you win, take it to be inspected by professionals.
I agree if you want the best guarantee, then buying it from a dealer is best.