Discoverability is just as much an issue as feature including. If you have to go into a special QR mode (which a lot of cameras did), you’re never going to use the feature, and it’s hard to break those mental models if the feature gets silently added in later iterations; you’re always going to remember that first encounter where something didn’t work seamlessly.
Indeed it is. It wasn't at all obvious on my phone that I could put a flashlight toggle on my notification bar, so for a long time I still kept the old Motorola DroidLight app, which, despite being unmaintained for a very long time, worked beautifully.
