This thread really has nothing to do with apps (as long as they are kept private) but with more basic intrusions of modern technology on the wilderness experience. If you read the above posts, you'll see complaints about aircraft, people's sound systems turned up too loud, drones, and other modern items that intrude on the experience and privacy of others.

Some of us prefer to avoid things like cell phone apps (in my case, even the phones themselves). That's a matter of individual choice.