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I actually have a proper set up chair and desk and never have problems.
Any time I even go near a laptop for a while longer than a quick 10 minutes I already experience discomfort.
So I have some doubts about that, but I do wonder if there is some link.
My guess is, it takes away the biggest advantage that a laptop or tablet or even phone has over a desktop computer. which is: mobility. Edited 2012-08-28 13:55 UTC
Well, research generally tends to trump personal anecdotes and feelings...
(how much of a ~placebo-like effects with those, here, regarding ~workplace layouts? Even more so if somebody has doubts when confronted with info contrary to long-held beliefs - quite a few of cognitive biases manifest themselves in such scenario. And I could quickly dig up some loosely related examples: http://plan9.bell-labs.com/wiki/plan9/Mouse_vs._keyboard/index.html or how, contrary to some people praising trackpoints, actual research suggests that touchpads are superior... http://cat.inist.fr/?aModele=afficheN&cpsidt=18522893 & http://en.wikipedia.org/wiki/Pointing_stick#Comparison_with_touchpa... - and note that voices supportive of clit are of "subjective opinion" in character; and personally I do like trackpoints, I'm used to the concept, but...)
Anyway, most human dwellings have a ~bed of some kind, so adopting the general position I described, while being portable, shouldn't be much of a problem ;p (OTOH, yeah, overall mobility probably greatly helps by itself, allowing for quite great variability in body positions)