Buying points involves paying more money up front to reduce interest rates. Given that someone struggling financially wouldn’t be able to do that I don’t think it’s fair to include them in conversations about the affordability of homes. It’s also not a great idea to buy points if you’re uncertain about whether you’re going to continue living there. It can take years for the savings on interest to recoup the up front cost of points, so you could easily lose money if something happens and you end up having to move or sell the home.
Edit: also the numbers the above commenter used are not far off, in the US average interest rates in 2021 went as low as 2.65%, and average interest rates in 2024 have been oscillating around 7%.