And yet absolutely no one works all day in an office in a seat reclined to the position of a reclined whY aircraft seat. Completely impractical to view an array of monitors and drive a mouse half laying down. You'd be craning your neck and wrist.
One unique study doesn't a consensus make. A study that did not cover how one could type, take handwritten notes, nor view multiple screens from that angle. My optometrist has been specific about the distance I need to sit from monitor/screens and angle for optimal viewing as to not create eye strain. My physio and I have also worked on seating posture and my back pain and knee pain has lessened.
Official guidelines at my workplace and from WorkSafe also support the upright neutral spine. Whilst standing desks were popular for a while, standing all day is also not recommended.
No my assertion on what is best for me is based on my personal experience. Practice not theory, and also the practical recommendations of Physio and Optometrist.
I won't be reclining at work or on any day flight, sitting upright with spine in neutral position is both comfortable for me and practical given the work I need to do.