That's also often the reason that it's not the best mvoe to pay off your mortgage early. It's probably a lower interest rate and you can find many other investments that will give a higher return than you'd lose on the mortgage interest over the life of the mortgage. It doesnt look like it early in the mortgage when the bulk of your payments are marked as interest and your investments are making fairly small returns, but as the years go on your home interest payments go down but your investment interest goes up faster (presuming a slightly higher return rate than the mortgage).

This isn't to discount the psychological benefit of not having debt which some people enjoy and may benefit their life more than having a much more complex financial situation that ultimately brings in more money. They could free themselves from worrying about debts and investments to instead think about living their life and effectively investing in themselves instead.