The danger in a downwind turn is provided by the windshear, not the pilot's perspective.
I beg to differ insofar as a) windshear can get me in trouble on, e.g., a straight climbout or approach as well, and b) pilot perspective apparently does make a difference when turning close to the ground, as explained
here for example. Admit though that I completely and wrongly ignored the windshear effect in my reply. Learned something new again.
(And will hopefully find the time for a gliding trial lesson just for fun and educational purposes next season.)