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A display mounted on a flat surface between your hands seems like a ready path to neck trauma.

You mean, like a smartphone or a portable console ?

No, much worse, because you are not able to lift it up in front of your eyes while typing.

Why not?

You can't hold it and type at the same time, this device has to be sitting on a surface to type.

How so? You can hold it with both hands and type with your thumbs. Or hold it in one hand and type with the other.