I do. We have a device that creates its own Wi-Fi and serves a web app to interact with it. We have a lot of clients that would like to be notified when a new firmware is released for the device.

Another recent one, a customer on iOS 12 did not understand why he couldn't save a file generated on the device to his phone. I told him it's not possible, but he can save it to iCloud (without a correct name though). I got told off about how bad we must be not to support such a basic feature. Don't ask me mate.