Same here, different trainers for different purposes. During our short stint with private agilities, the trainer asked to take the leash to show a moving exercise, I had not yet taken off his prong (used only to bring him in),and I don't think she noticed either. when she was keeping pressure on the collar while he was sitting quietly next to her, I told her to relax the leash as there shouldn't be any pressure on the prong. She didn't get it. Had no knowledge of it. She was a good trainer for agilities though.
Fodder, you sound like you found the jack of all and the master.
"If you can't see his soul when you look in his eyes, then you need a seeing-eye dog"