It’s not the reason you think,
There are amusing anecdotes, such as when Myerson recounts how research conducted for the design of Heathrow Airport’s Terminal 5 in London led to the revelation that older travellers use the toilet much more often than younger ones. “Tell us something we don’t know,” airport officials responded.
“Well, I said, do you want to know why they go so often? They go to the loo to hear flight announcements.” It turned out that the small, ceramic-tiled environment of the toilets was the perfect place to clearly hear announcements that tended to be muffled in the rest of the terminal, so designers came up with the concept of ceramic “acoustic arches” that serve as information pods scattered throughout the airport.
Little details matter. When designers get something wrong, people respond, and sometimes in ways you wouldn’t expect.
(HT: Rapid Travel Chai)