I can tell you that back when I worked as a dev for the department building order fulfillment software at a dotcom, my perspective on my own product has drastically changed after I had spent a month at a warehouse that was shipping orders coming out of the software we wrote. Eating my own dog food was not pretty.

Yeah I've wondered the same thing about jobs in general too.

Society would be a very different place if everyone had to do customer service or janitorial work one weekend a month.

Many (all?) Japanese schools don't have janitors. Instead students clean on rotation. Never been much into Japanese stuff but I absolutely admire this about their culture, and imagine it's part of the reason that Japan is such a clean and at least superficially respectful society.

Living in other Asian nations where there are often defacto invisible caste systems can be nauseating at times - you have parents that won't allow their children to participate in clean up efforts because their child is 'above handling trash.' That's gonna be one well adjusted adult...