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Lots of variables involved...
For me the basics of how interest works is to pay as little as possible, earn as much of it as possible.

If you've gotten good gains in stocks, lock them in by paying off debit even with the cap gains tax. (after doing the math of course and based on your willingness to reduce investments)

We have bought a couple vehicles from stock market gains (thanks Microsoft early on and the S&P 500) and the hit to overall wealth has been more than worth it, plus I simply hate monthly bills.

Front loaded interest on many mortgages bugs me. I'm lucky my wife and I have always been on the same page with debit- charge as much as you like but the CC bill always gets paid in full.
When we were making mortgage payments we would at least make a yearly "extra" payment that went to the original money borrowed and not the interest.

We paid off my/our first home (now a rental) in 10 years, our current home was paid for in 12. That freed up finances for more investing.

I sure have no regrets, being mortgage free seems like a crazy dream but it's absolutely possible with self discipline and living well within your means.
I don't have any issue with driving a older sedan, truck and 911 since they have been paid for for a good long while and kept in good mechanical condition.
"Keeping up with the Jones's" has never been more than a passing wish. I'd rather be financially comfortable driving a 10 year old car, 12 year old truck or a 53 year old 911 than driving a new one that is more the banks than mine.