. Why can some devices be used with a 0% dead battery as long as they’re plugged in, while others have to be charged a bit first?
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Doing both (charging and using) add more cost and more space. In some rare case it could be as a safety measures
Like for an electric razor, likely to be used in a bathroom, maybe with water around, and using it while plugged may not be the best idea. (even if I’m pretty sure it is also, nowday, to cheap out since in north America we are likely to have GFCI plugs. Though I have no clue about the international market and how easy we can sue them internationally).
For a cellphone, space is already a big issues so they want to cut that.
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