If a person can not buy a house that performs equally with rent, at the onset of the mortgage and gradually begins to out-perform rent ,and save, how can they rent and save?

A person who can rent and save can be a homeowner and save. If one can’t save in either situation they might as well be homeowner( If they want to and can stay put for a while).

Same disclaimer about reasonable entry time and rents and mortgages being in the same ballpark.