I have found that I can always do a better job of sharpening than my camera -- at least one that is more to my taste. I therefore always zero out camera sharpening and replace it with a USM adjustment step. I think you would call such a step "capture sharpening." If I need some selective sharpening, I add one or more USM or high-pass adjustment steps, each involving some kind of selection.
Yes, now we are on the same page.
You say the primary purpose of USM is to control noise.