Who cares about an extra loan payment if you aren’t the one paying it.
This all stems from someone claiming an empty property still generated profit. You seem to be arguing that if someone else is paying your mortgage (i.e. a renter) then you can profit by borrowing against the equity in the property. I agree with you, but I don’t see the sense in borrowing against an empty place as you are just giving some of your profits to the lender.