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I think that all in 1 works if the "all" is limited. What is comfortable for working might not be comfortable for gaming, or websurfing, or reading, or listening to music, etc. Different sizes and different screens depending on where you use you device, the compromise between battery life and the power that is used, how rugged the device needs to be depending on its use, etc. If you want to optimize the device for each task, then you want more devices.
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