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.
Off-topic, but: do you need some Garmin account to use these functionalities? I am looking into such a watch, but would not like to be dependent on some online service/account to use it.