Cheap energy means lower costs of manufacturing therefore lower prices for consumer goods, thus increasing quality of life.
What has decreased the quality of life, which offsets the above slightly and makes it appear as thought things aren't improving much, is goods that require domestic labor, such as education, whose price has outstripped CPI, and goods that have artificial regulatory capture which cause their price to be artificially high, such as insulin, and demerit goods such as opioids which detract from the utility of the customer.