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Please Don’t Make Me Download Another App | Our phones are being overrun
(www.theatlantic.com)
This is a most excellent place for technology news and articles.
I remember getting a boarding pass from an airline that was only offered in their app or printed at the airport, no email/download image/PDF option. I didn't have to install their app, but I would have had to waste time at the airport otherwise. I removed it when I was done and left it a negative review.