Is capture sharpening defined by the mean, as opposed to its goal?
I'm not sure I understand the question. I would think that Capture sharpening is a means to achieve the goal of a better quality file to work on, without the blur that the Capture process inevitably creates, who wouldn't want that?
It also creates a more uniform type of image quality to base the following steps on. Without it, one would need to use different Creative sharpening for each image if they were shot with different lenses and/or apertures. With Capture sharpening one may use much more similar Creative sharpening, perhaps even just presets.
I personally don't mind the theorically less adapted algorithm of detail=0, as, in practice, its much lesser effect on noise can give me an image that I feel closer to the capture that with detail=0 with my noisy cameras.
Noise reduction has become pretty good over the years. Besides, Noise is not the same as the Detail you can recover with proper Capture sharpening, and noise may look very different if the Capture sharpening was sub-optimal.
To get back to the topic core, I'd really like to have a separate tool for creative sharpening too.
That seems to be the general consensus.