If housing is an investment (“a nest egg”) then the people and policies that support it as an investment will stand directly opposed to people and policies that want housing to be affordable and a right.
Housing cannot be an investment vehicle akin to stocks in a society that meaningfully values housing for everyone as an objective to strive for.
He’s saying what you’re attributing to “a specific lack of willpower” now has scientific backing that disagrees. Your take is old school and misinformed if the current science is correct. I personally haven’t done research on the subject or read many studies but Adam Ragusea, a YouTube food science journalist covers this concept in one of his vids and several podcasts surrounding food science and (in my case) the drugs coming down the pipeline to regulate body weight touch on the research as well.