Something tells me your neck would ache after the sixth hour of a headset on it. Though, I'm largely sympathetic to the idea. I get that looking down feels off. Oddly, I'd also wager it is more similar to how things have historically been done. Used to writing and such was much more "at hand level" than it was elevated. Even physical work is often such that you are looking down more than up.
Sucks to say, but it is almost certainly the case that you need fewer 6 hour stints of work. Go for a walk. Think. Do some physical labor. All things are likely a good idea to help with aching bodies.
