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You don't need to charge your keyboard and mouse from your computer; I'm assuming you have a USB-A power brick from your phone, tablet, etc. already that you can use to charge your stuff.

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So, yet another device to carry around that used to be part of the functionality of a laptop.

No, not really, since you'd have to carry around a USB to Lightning charging cable even if your laptop had a standard USB-A port.

If you were already carrying a 15" laptop plus full-size external keyboard plus mouse plus power brick for the laptop, a dongle is not much of a burden to add on. And many people who did that with USB-A machines tended to carry other accessories as well and end up with an external USB hub in the bag too.

I have a keyboard and mouse at my desk. I plug them into my laptop when I'm working at my desk. I don't carry them with me at all times, though, and I don't know many people who've ever done that.

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