In these days of self-checkouts and Instacart and Amazon pick-up points, we don't have as many personal interactions with the people making the world around us work smoothly.
Gone are the days of milkmen and more and more places are adopting "community mailboxes" instead of door-to-door delivery. The gig economy means that faces come and go as each Lyft, Uber Eats, Postmates, etc. joins the market.