I'll never not buy a new car. The peace of mind is like no other. I've been there. I've drove absolute beaters. It was the WOAT when you have to be somewhere but your car says otherwise.
The car you're driving right now is a used car. Do you not have piece of mind over it? It was new, someone (you) bought it and used it so now it is no longer new. Are you suggesting you don't trust the manufacturers of cars to make a stable product?
I totally get making poor financial decisions. What I don't get is the mental gymnastics people go through to try and make those bad decisions sound like good ones.
The piece of mind you speak of in a figment of your imagination. The truth is you can get a 3 year old car turned in off a lease, low miles, regularly taken to a dealership with provable service records documented and you can get the car inspected before purchase. The mechanical difference between that car and a new car you buy at the same point of their lives that came off the same assembly line is negligible. Also @ CPO you'd get a manufactures warranty for 3 years after purchase.
Let's say this car is a 2020 Honda Accord. You avoid $6000 in depreciation charges. If you invest that $6000 for 30 years at 8% average return, you never touch it again or add to it and it site at the end of 30 years that $6000 in avoided depreciation is $60K. That's enough to buy 2 brand new Honda Accords when you're ready to retire. Do that 3 times in your life at 10 year intervals and that's an extra $101K you can retire with and all you had to do with duck $18K in depreciation cost.
Buy your peace of mind is worth the opportunity cost of turning that $18K in depreciation into $100K of money right?