> All the money the borrower dedicated to paying off the mortgage gives them nothing in return. Essentially robbery.
This is exaggerated to the point of nonsense. I.e. it's literally not clear whether you are hyperbolising for effect, or have no idea what you're talking about.
You pay the bank for the use of the money. After 1 fully-paid year of your 30 year mortgage, you own 1.2% of the property. Or more precisely, your debt obligation is reduced by 1.2%.
After 15 years, you own 32%. After 20 years, 50%. After 30 years, 100%. It's not linear, which upsets people, but it makes perfect sense if you do the math.
In the mean time, if the property appreciates in value, all of that extra value belongs to you.
If you stop paying the mortgage at any time, yes the bank will repossess the house to get the money you still owe them. Not all of your future payments, just the remaining debt. If the sale price is in excess of your remaining debt, they send you a check.
Moral of the story: Do not mortgage short-term housing, except in rapidly increasing markets. And even/especially then, beware.
Corollary: Rental property is a necessary thing, and landpeople provide an essential service.
Reality: Some landthings suck.