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Yeah I don't envy drywallers. That is exhausting work, especially since a lot of them get paid by the sheet. There's a running joke in construction about them constantly leaving soda bottles full of piss because they can't take the time to go to the john.

Electrical construction (I mostly did commercial fwiw, but dabbled in residential and industrial as well) can be pretty rough too. Other than the brief time I worked with the union, you're pretty much expected to bust ass all day every day, forever. It was... not fun, most of the time.

But you're right on the last point too - once you really understand the system, most faults can be tracked down and figured out pretty quickly. After all, electricity is basically binary - either the circuit works, or it doesn't, in which case you just keep following it back to the part where it does work, and now you can find the problem.

It's not always that simple, like if multiple circuits are sharing a neutral, or you've just got a loose neutral connection... but as you may guess, if you've got power where you're supposed to but the thing still won't work, the problem is the neutral. So... it's still kinda simple lol. There's only so many parts to a circuit after all.