You have long believed USB is categorically bad. Tech keeps on evolving, if one is using a dedicated streamer with USB output, USB is equally capable of delivering higher performance equivalent to SPDIF/AES and i2S. The final sound quality would also depend on implementation of these protocols within partnering DAC. Jitterbug was specifically designed for applications where general purpose laptop or computer being used as streamer as general purpose computers are inherently noisy.
i2s requires careful selection of components as handshake between the two components is not given. I guess these handshake issues pave way to DDC re-clockers. IMO, they are totally unnecessary if you are using a high quality streamer + DAC.
DAC’s with Ethernet cards (renderer) are the way to the future for anyone looking for one box solution. I agree, this type of component has a potential of a very high resolution sound. But then again, someone with deep pockets may disagree, you know that separates vs one box argument.
When it comes to streaming, there are so many ways to skin the cat!