In the 1990's a business school undergraduate professor introduced us to "The Peter Principle", which explains that people are promoted to their level of incompetence. When they can't do the job, promotion usually stops.
For example, when working in occupied buildings & people are standing around watching, they are asked to help.
With residential service work, homes are always occupied, and the owner is usually interested enough to ask questions.
So of its the owner, I ask, "do you want to save money by helping me get out of here sooner"?
"Can you hand me that tool, and get me that part?
"Hey, your real helpful. Try pulling this wire while I feed it to you".
Things go well, until the "Peter Principle" kicks in, which is usually during finish wiring, and device terminations.
Never seen a novice strip wire without nicking it, no matter what tool, or how many times we try.
Same goes for landing #12 solid properly on lugs, or getting devices in the box, no matter how many times demonstrated.
Neither can novices be trusted to work around anything energized, they get zapped every time.
When spending more time teaching than working, promotion stops, and people make a parts runs to get out of my hair.