You're misunderstanding my point, and the post I responded to. He said that it doesn't matter how light ANY tablet is, because even if you hold nothing you get fatigue. Or, presumably, any phone, because even holding NOTHING is too hard. So the argument isn't that the SP3 is too heavy - it's that the simple act of holding, even holding nothing, is too hard.
Is your argument that the SP3 is too heavy? That's an entirely different argument. Presumably, there's a fix for that (make it lighter and easier to hold). For the poster I replied to, there IS no fix because nothing is light and small enough, ever. Not even a phone.
But yes, in bed you're not going to hold something above your head. That would be asinine. Why are we debating this, again?