why the downwind turn thing is a myth
In the context of a turn toward final approach for landing, might that be because it is uncommon for pilots to elect for a downwind landing? So turns progressing toward the final approach would most often be more and more into the wind in most circumstances?
Surely if a pilot were aware that a downwind landing were inevitable, they would greatly increase their allowance for speed and space. The approach turns I saw on the video were not being flown with a demonstrated concern for the possible effects encountering downwind conditions for final approach and landing.
Sure, a turn out of the wind could affect the plane's handling. But not so much as flying a low altitude progressively tightening turn, with slow and possibly decreasing airspeed, and low awareness of an impending unsymmetrical stall.