Very nicely stated, and well and logically argued.
You have made the perfect case for why, when I am able to have people "work for me," I organize things as "piece work." I pay for a specific result, a fee-for-completed-item.
The completed item is what is of value to me, provided that it meets quality standards. I care not at all how long it took the person assembling and testing it for me. The faster they can do so - with quality - the better for both of us.
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I prefer to work at a piece work rate when the job allows for such a measurement. It feels most honest for me and my employer alike.