Does this definition imply that most, but not necessarily all, instructional dives are trust me dives? If you're receiving instruction, then presumably you haven't done the type of dive before (e.g., deep, night, wreck).
Prior to the dive, you should have been briefed or discussed the necessary skills in the classroom, but until you do the dive, isn't it still a trust me situation?
Just to be clear, by definition, I would have to trust the instructor or else I wouldn't be receiving instruction from him/her.