Larry, while I agree with you in principle, the current reality is that a lot of people have DACs that don't have async USB, or don't have USB input at all. For those people, a converter allows them to get sound out of their computer, and a good converter allows them to get better sound. The growing number of USB to SPDIF converters on the market attests to the demand for these products, though I do think that over time the need for them will diminish.
What I'd really like to see would be some ethernet to USB or SPDIF converters (but that might require a layer of software that would make the products less convenient).
What I'd really like to see would be some ethernet to USB or SPDIF converters (but that might require a layer of software that would make the products less convenient).