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Even an standard office worker will be more productive with two screens and a proper keyboard.

I don't see the relevance of that. A Chromebook can be configured with two screens and a USB keyboard.

Sure, if they got used to it, but I don't think it would make a huge difference.

Most people in the world get by just fine with one screen and one desktop – anecdotally, everyone I know who is not in tech or design does...