Nobody's suggesting doing such though (yet the comment seemed to imply someone had). The suggestion was to save a meager $10K/year, which is tiny relative to the salaries of most people on here.

It's 20% of the gross median household income. For the typical family it's probably closer to 25%-30% or more of their gross pay net of taxes. That's a lot of money to save for this kind of household. It's simply not a realistic goal for the majority of households in America.