There's a lot more variance in pure functionality between weather apps than between flashlight apps. Flashlight is literally 1 bit of information (on/off) and

There's a lot more variance in pure functionality between weather apps than between flashlight apps. Flashlight is literally 1 bit of information (on/off) and after that you can only add more sophisticated triggers (gestures, timers, etc.), which is why native OS functionality typically makes apps completely obsolete. Weather data is a lot bigger: not only are there are a handful of different providers, but you could spend a lifetime optimizing the presentation of the data on a 6" screen (let alone a widget or notification). You can't possibly fit in all the relevant numbers so you have a lot of room for UX design work.