I think most people should separate the discussions of many subjects instead of mixing them all up together:
1) Do you need that expensive vehicles. New or aged doesn't matter. Everyone has a different need regarding to what kind of vehicles to buy. Some like Prius, some like M3, some like Tesla, some like mini van. You can't force someone from a crew cab into a Prius because that's not what they want, or the other way around because they may not be able to afford it.
2) Is new or used a better deal? That depends. So far I have no regrets on all my new cars purchases. I negotiate well, typically to a point of my new car being almost the same price as 1-2 year old used, and over 20 years typical ownership I got what I want instead of buying something I don't (like instead of today's newer better car I was forced to buy something that is older and less efficient, etc). Plus I can get better interest rate financing instead of cash, so the cashflow in my investment compensate for some of the loss had I pay cash to buy a used car or finance with a higher cost. It may not work for everyone and it may not work for every kind of cars out there, but so far it works for me. I always review both new and used to see what works better.
3) Is financing a better deal? Depends on the deal. At 7% interest probably not (although I typically get about 10% market return in my investment, after tax it is less than 7%), but I once got a 1.5% rate on a car I already bought in cash, just went to my credit union to take advantage of that plan and open an account there. They ask me why I would send a paid off in cash car back into a car loan and I told them it is cheaper than my mortgage and I am using it to pay off my mortgage and pocket that 1.5% myself for free. It worked out well.
4) Is new car better or a beater that may need some repairs here and there better? Can you afford it breaking down? Do you have another car to use as a spare? Are you good at DIY? If you can't afford to miss work you probably should only buy less than 10 year old Corolla and call it a day, none of the iffy brands and none of the iffy models. I don't see buying beater being the best choice always, even if you save a few grands. I have a friend who got fired because his car broke down and he missed too many days at work. He regretted buying that beater and went back to a much newer Corolla afterward.
Split these decisions up and the answer depends on the buyer.