This doesn't mean they are rock-headed. Like all of us, they could have a blind-spot where a decisions made may not be in our long term economic interests.
It’s much easier to get a car with a $350/month car note where you won’t have unexpected repair expenses than getting a $200/month car note on a car without a warranty and then have an unexpected expense.
Now we have a credit card with the car shop we used that has a six months/no interest program. I use that even if I do have the money. But if we had bad credit, we could get a car loan much easier than an unsecured credit card.
I am at a point in life now where I can afford an expensive car repair bill and it just stings a little bit. When I was first starting out decades ago working at night as a computer operator while I was in graduate school during the day, any unexpected expense meant a call to my parents. Many people don’t have that luxury.
It can be rationalized with emotions, but not financial sense.
As far as four vs seven years. You’re hoping that you can figure something out in four years.