Don't know if I can point out a flaw here as I hate debt, have none and wouldn't like the thought of being tethered to a mortgage...
...BUT...
my brother and I...
(1) I don't have a mortgage, have much more disposable income, cash on hand and savings than him.
(2)He is around 100-150,000 dollars wealthier in real terms than I am and if he sold up now he'd be in the same position as me except with that decent amount more in the bank than myself because he chose to get a mortgage.
It's not a bad investment and one you needn't feel truly tethered to as you can sell when you want.