"Then pray tell how exactly "every other person who is not a DAZ PA does it" ?"

Based on my reading they take it to zbrush then subd the base figure for higher detail. Then they do morphs, adjustments etc then take sub d off and export the morph. They also do a fair bit of work on the figure with displacements and so forth for things like wrinkles etc. They they take that high resolution information to a program like substance painter where they are able to use the information to bake the correct maps to get the desired look without having to have such a high dencity mesh. Of course all of this is only based on a few hours of research related to other things since I don't have zbrush.

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