I replied; "just enough to get the job done correctly. If too little is done the need is not met. If too much is done effort and money are wasted".
Perfect is not the enemy of good; it is the the enemy of adequate.
It’s really hard to say. In business, you want to delight your customer, make him feel he is getting his money’s worth, that a job is done right. Especially true of electricians. OTOH, you cannot give away the store, do a lot more than is required.
When I wired my own house, I used bigger boxes than was necessary, partly because they were easier to wire, partly because they are easier to rework, if you want to add a circuit or change out an appliance or switch. Contractor wiring is generally (though not always) done “right”, but electrical contractors especially, always seem to do things as cheaply as possible and still comply with code. But you don’t pick them, the general contractor does.
Years ago back in New Jersey I saw a truck with the company’s name on the side: “Adequate Fire Protection”.
I sure got a kick out of that. And still do. I know there is A1 Fire Protection, AAA Fire Protection, etc.
“So - are you guy’s any good?”
“Yeah - we’re adequate”
But - perhaps they were taking your statement to heart!