Many years ago, Apple often disliked the idea of having a flashlight function into their iPhones. Users had to use 3rd party apps to do it. However, they followed the trends of Android and had a flashlight built into iOS. The idea behind this was the portability and convenience of a mobile device.
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It would be a “nice” thing to have, especially on the small chargers. It could be used any time and anywhere, and by anyone. Flashlight on Bigger charges is overkilled, as people don’t carry those often everyday.
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The flashlight with a chargers is useful as it could act as an emergency gadget, especially at night and when you had no power. The high capacity of the charger will help the light to last forever. Flashlight with phone can be used while walking but when you need casual constant flashlight (e.g in the camping tent, checked out the car at night, etc.), a flashlight on charger is more useful. Another problem with flashlight on phone is: mobile phones are personal devices, with many things on it. you wouldn’t want to lend someone your phone to use flashlight. One more thing is: flashlight on the charger is cheap (compared to phone and other dedicated flashlight), so it has a decent value.