Earlier quoted context omitted.
Retailers don't do this because of published studies. They do it because they've tested it internally for the last 40 years.
Reminds me of people who tried selling sturdy repairable phones with longer battery life. Even when people complained about battery issues etc. They kept buying the thinnest flagship. Mass markets are mass market.
I think it was Vertu who first recognized the potential back in early 2000s, The Matrix (1999) made a visual point of it, and since 2007, Apple has been building their entire strategy based on that, with enormous success.
People who need sturdy phones do exist, are few, and they don't brandish them, because these phones are well-beaten.