Why do people spend money (and quite a lot of it) for devices that have less functionality than a smartphone?
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Tablet is just a bigger screen, but not same power like a laptop.
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Smartwatch is just tracking device that sends even more of your personal data.
And BOTH are another battery that you have to worry about.
Well, i guess so.
By that logic, an external, portable screen connected to the smartphone is even more functionality!
External screen is a bit hard to use on a train though