It is almost as if "maximum prosperity" and "maximum efficiency" aren't universally relevant to everybody.

It becomes especially irrelevant if the benefits accrue unevenly, but even if people are well-incentivized, there are often other goals that are more important. E.g "My family" is a popular answer for many people. "Ethics" comes to mind, too.

If we cannot see the world if not through a lens of efficiency, we'll fail to understand it.