I use an etherregen, as it facilitates the optical connection. Beyond that I am not sure what the hell it does. But I can't figure that out because I'd lose the optical connection ability if I remove it. Maybe I should go back to coaxial or RCA and avoid optical. But then wouldn't that introduce lots of noisiness from the outer world. I really like optical as it probably reduces noise.
I got the X1 because of the dac and its ability to get along with the lumin. I hate the idea of dealing with all the various separate dacs out there. So many rabbit holes. And also wanted to avoid all the connectivity challenges and rabbit holes.
It's a fine streamer dac. There are so many other places worthy of more attention in my system.