I still don't think you're appreciating or demonstrating an understanding of how debt affects people's thinking and behavior.
I have dozens of friends and family who are in the top 5% of the US population in terms of math skills who have all tried to play "smart" games with debt and come out as big losers as they continued to play. I'm talking software engineers, dentists, doctors, pharmacists, tenured math professors, and so on.
The problem is not math skills. The problem is not managing deadlines. The problem is that these people are human and are not immune to the pernicious effects of debt. Even you. Even me.
Here are some things you haven't considered or acknowledged:
* How debt influences the choices we make. Would you have bought such an expensive car if you had to pay cash? Statistically, the answer is no. If forced to use cash, might you have opted to buy a less expensive used car? Are you sure you didn't buy thousands of dollars more car in order to "save" a few hundred bucks?
* How managing debt takes over space in our minds. What could you be if you could free up mental capacity for other things?
* How debt warps our perspective and plays to our human weaknesses and short-term desires. Are you sure you're coming out ahead? How do you know?
You can't run an A/B test on yourself, but you can open your eyes and take a look around. It's not pretty out there.