What was described; capture, creative and output sharpening is not an "Adobe workflow" as you say but a sharpening workflow worked out as a multi-pass sharpening workflow by the late Bruce Fraser...yes, Adobe has adopted the sharpening workflow concept into Camera Raw and Lightroom, but it isn't an Adobe thingie...
C1 can do capture sharpening just fine and in the new C1 6, it can do output sharpening upon printing. The local creative sharpening is somewhat limited however. But for optimal final image quality, I seriously doubt any single sharpening workflow will be superior to a multi-pass sharpening workflow...oh, and it ain't a "reasonable compromise" as you call it but an optimal workflow for IQ. See Out of Gamut: Thoughts on a Sharpening Workflow by Bruce Fraser.
I don't think we are in disagreement here...we're just looking at it from different angles...
IMO there is no such thing as "optimal workflow for IQ"...it might be optimal for SOME applications. In today's commercial world, workflow wise, a lot of the "creative sharpening" is done by retouchers on an already processed image, meaning that "capture sharpening" is either done by the photographer or not and that "output sharpening" is either done by the retoucher or by someone else afterwards, yet it is still "optimal" and is based on multiple software solutions.
That's what I meant when I said that Adobe's workflow is only one of many. Also if the math involved in one workflow is better than the other and is based on less steps and still provides better final results then which one is the more "optimal"? I don't think there is one answer...