Great Summary @mapman ! Certainly eARC over HDMI can carry the higher resolutions and formats, and can be very smart and clever when hooking components. But I have had issues with incompatibility on some TV's. For my simple video watching, Toslink direct from TV to DAC or Streamer works great for killer 2 channel with imaging that bests many center channel set ups; and it is bomb proof.
@glennewdick I see little advantage of converting Toslink to HDMI, unless you are missing the Toslink digital input. Am I missing something?
Happy Holidays All!