In his CNX2 Sharpening video, Jason Odell does capture sharpening as the last adjustment step, but he doesn't say why. I was guessing it had to do with performance. However Jason leaves camera sharpening on until he is ready to do capture sharpening! That way, he works with a sharp image in the earlier adjustment steps. As you point out, it is important to have a relatively sharp image when applying other adjustments. So his solution has it both ways!