As said previously I have explored I2s in depth and I wouldn't get hung up on it and think you are buying into older tech such as USB, AES and SPDIF.
The USB powerline interference has been mitigated by DACs using Amanero USB Boards, which receive power directly from the DAC's power supply, not from the host via USB cable.
I use electrical tape to tape over the +positive line at both ends. This prevents EMI/RFI interference and stops the wire acting as an aerial, if you only tape one end. Don't tape the -negative line as this is the ground. Many instructions online.
The Amanero Board is why USB can outperform AES/SPDIF in many systems, various manufacturers use standard and modified versions.