It probably is range, partially. You need the anchor as low as you can get it for the longer distances, even shooting shoulder-crushing holding weights of 50lbs or more. Else, you'll be blowing your sight pin off your bow lol.
Otherwise, it's probably convention, comfort and repeatability. I did try various different methods in my desperate attempts to become a good oly recurve shooter, but none of them helped. Retiring my recurve career and coming back to compound with a release aid is the only thing that seems to have worked. Recurves everywhere are still sighing in relief.
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