Agree with this, especially about movement. Overall the main bad thing about regular desks and comfy chairs, is that you can sit at them without changing your posture for hours, which is bad for everything: blood circulation, posture, muscles, etc. "The best posture is your next one."

I work from the floor now mainly... it's cheap, portable, forces you to move, doesn't require anything besides maybe a few pillows and any coffee table or raised surface for a laptop.