Bill Tindall, E.Tn.
I keep in mind Alan Batty's description of drawer making in a British factory where his quota was completing 6 drawers per day. I'll believe someone has a better way when they are claiming 7 drawers a day.

If I understand what you are saying, either in theory or from experience I can't tell, is to independently mark both tails and pins to the requisite 0.002" spatial accuracy by some means that remains unimaginable to me. (needs for accuracy is doubled in this case because of error summing on the two independent cuts)

Such a goal would likely be so daunting to a beginning woodworker they would dismiss dovetails forever. An experienced woodworker would have the joint made in the time it took to do this high accuracy marking, I guess, giving that I don't know how to accomplish the task.

The slow step in dovetail making is not marking and sawing, it is waste removal. In experienced hands the first cuts, be it pins or tails, are done by eye. Transfer of this result to the mating board takes seconds if clamps are eschewed . The benefit of your proposal remains elusive, maybe because I don't understand it.