I hate to admit it, but I am kind of one of them.Took me a moment to get #16.
And #32 is so true, so many Moira players completely forget about the other orb.
I blame the fact that I am just not very used to her control scheme. I always had huge issues with how the healing and damage felt "swapped" (left click heal, right click damage) so I changed it in the settings to make it easier for me to use, and since the orb follows whatever the main attack and heal are set with, it also switches those. I also set the orb "start" to my middle mouse button, which for 90% of my other heroes is a damage ability, so I end up hitting it then instinctively hitting left click for the damage orb.
With the Sym changes incoming I am considering making Moira a new support main alongside Lucio, so hopefully that will help me get better with it.