one suggestion point or what i deem the "ergonomic posture oldskool mis-use" is that old skool ways of determining posture, just doesn't work or scale with technology.
I'll give an example of this that 99% of us are used to and do... driving.
now i don't want to get into the (i love to lean all the way bag and look cool...)
this is just stuff i've seen and picked up on.
The way to determine proper seat is to stretch out your arm, and your wrist should touch the top of the steering wheel, while almost being horizontal.
this combined that your foot should touch the gas/brake pedal at a 90degree angle.
we can all sorta agree that, this seems to be good posture not only for ergonomics (some ppl drive hours) but for safety as well. This is finite... what i mean by this is that, your vision (windshield) will most likely never change, the car is mostly going to be a certain height from the road, the roads aren't going to be more narrow or wider in the next 20 years.
However, old ergonomic suggestions were made with old technology in mind.
It was made with the fact that desks, are just desks and usually just desks for writing papers, now we have desks that change elevation, have swing out arms for keyboard trays, and new styles of "stand up" and drafting.
i read a while ago that proper length from a monitor should be the distance between your out stretched-fisted hand... this might've worked for old 14in crt's in 1992...
i'm rocking 2 24in monitors, if i used that old way to measure, i'd have to move my head from left to right everytime i read a webpage, this is because technology changes our environment... unlike a car, a mustang from the 50's is relatively the same as the newest mustang, but a 1992 setup compared to a current gen setup is VASTLY different, ergonomics has NOT changed with the times.
i do NOT follow the ergonomic suggestion of sitting up straight, like you have a vertical stick up your a$$. and no i am not a hunchback of notre dame, i have to thank my mom for that, everytime i even thought of hunching forward, she'd smack my back and i'd be straight, in fact my spine is almost perfect (said my chiropractor, i don't use one, just to get bone scans). No instead i lean all the way back, and let technologically amazing mesh fabric cradle and keep my head straight, while also having the lumbar support to keep spine at a proper curvature and not feel pain. I could sit like this for literally a whole day straight, while doing the stick up my a$$ "ergonomic" position gave me enough pains to seek out those quacky chiropractors (they aren't real doctors).
i'd like discussions like these, what you've tried, what you've done, and how we can all use this information to cobble together some guidelines, again what works for some won't work for many or the opposite, cuz when my 6 1" friend comes over, he can't use my setup, hell i don't even let him sit in my chair! (it's rated at 250lbs!!! mesh fabric)