Part of that has to do with how our economy is built around credit cards and debt itself. They don’t want you to fully pay off your credit card debt, and will reduce the amount you can borrow if you do. And if you try to opt out of the debt system entirely, it hurts you as well because you have no credit score from the credit card companies and no history of paying off you debt on time, which hurts your chances to get things like loans and mortgages. I hate debt, and ran into this issue the first time I went to buy a car because I had always used debit cards to buy stuff. Despite the cards being Visa cards that just got paid off immediately by charging my bank account instead of being paid off over time, I didn’t have any debt history as a result and had to have somebody cosign my car loan to vouch for me that I’d actually pay the loan.

are you talking about the comment mentioning it makes financial sense to not pay off their mortgage?