Subjective measures of "quality of life" can only be determined by a person (s) living in each frame of historic reference, not someone else living in a completely different historic frame of reference. To do otherwise is to impose upon those historic peoples our own measures of "quality of life" which as we know all too well from prior discussions on this board lead to incorrect and missleading conslusions.
For example, who today is to say that a Black living in Ghana in 1800 enjoyed a higher or lower quality of life than a Black Slave living in Mississippi in 1850? It is impossible to make the comparison as you have just done. Based on circumstances in each time frame, the 1850 Slave, living in Mississippi may have believed he had a higher or lower quality of life, IN HIS HISTORIC FRAMEWORK, than the Black living in Ghana fifty years earlier would have concluded about his quality of life.
I should add that "in general" I would agree with what you just said, but, as you inferred, your stattement was just your "take" or "opinion," not fact.
I hope you do not think I am nit-picking.