Originally Posted by
stedalus
KOPS is a relatively new idea, so I think at the time when slack STAs were common, no one cared about it. Having your weight distributed comfortably when in an upright position was more important (and still is to some).
Relatively new, yes, but still more than 40 years. I was hearing it in the '70s. (And I have never done it except out of curiosity to see where my preferred position was relative to KOPS.)
Edit: I'm answering a 6 yo post. KOPS was relatively newer back then!
Ben