I'm guessing you're an engineer (please correct me if I'm wrong). And what you're effectively saying is cars aren't designed to last longer than their warranties, and in fact you don't even have data on what happens afterwards. It sounds like you're passively participating in obsolescence, even if it's not intentional. Apart from that, the people actually selling the cars absolutely have a financial incentive for the cars to fail as soon as the warranties are up, which is conveniently when you stop looking at the data.