This argument is laughable. We all have smartphones so serious wealth inequality is OK? These days having a phone is a near requirement.
Toilets are also a "near requirement" in any meaningful sense that phones are a near requirement. But toilets (and sewage more generally) are obviously quality of life improvements over what humans had in previous epochs of history.
Stated more succinctly: hasn't it always been common for major improvements in quality of life to eventually become the default, rather than the exception? Or am I misunderstanding your point?