Earlier quoted context omitted.
> There is no possible way to maintain a healthy posture without an external display. I know a physical therapist who would strongly disagree with this; in fact he explicitly recommends to use a laptop for ergonomic reasons unless you can achieve a proper, ergonomic setup with an external screen. The reason being that if used properly(laptop far back so you can rest the whole forearms and elbows on the table) the ang…
Given OSHA's recommendations on setting up a computer workstation, I think perhaps you need a new physical therapist: https://www.osha.gov/SLTC/etools/computerworkstations/index....
The truth is, it's really hard to do a double-blinded study for these kinds long-term health concerns.