The pairing of additive and subtractive is especially powerful if used iteratively.
For example, I design and 3D print a dozen items only to discover through use that some part of them ought to be different. Instead of reprinting the complete item I only wish to correct the defect. I update my CAD drawings and then process the difference, first through the CNC driller, then through the 3D printer, once for each of the dozen items. As this design amendment / remove / reprint cycle is repeated the CAD drawing evolves, maintaining the most recent design, so when a 13th+ item is desired it can be produced directly and correctly.
