The benefit of a USB cable connection is that, for most devices at least, it acts both as a data connection and charges the machine at the same time. Eg, with a Gen3, plugging it into a PC for 10-15 minutes a day is enough to keep the battery fully charged. If it had a wireless connection, I'd still be connecting to my PC to copy content across, but then I'd have the hassle of having to make a separate "wired" connection just to charge it.
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