Mxsmanic wrote in
:

The wingspan shouldn't matter.

I haven't studied geometry in a long time, but simple geometry would dictate
that at a 45 degree angle, vortices generated by the higher wing would
naturally need to fall some distance before they could not be intercepted by
the lower wing.

To convince me, I need an explanation of why wakes descend universally
except by some magic exception when someone is doing a 360-degree turn.

I am not able to explain to you the scientific principles behind why I have
observed what I have observed. I can only tell you that I have observed it,
as have numerous other pilots, and the fact that you don't believe me is your
problem, not mine.