not everybody likes the Lumin sound and operating system and the choice of fiber-only servers/dacs at the moment is still limited. Also, not all networks are fiber-optics and for those still coming off copper the optical converters and their PSUs open another can of worms. On short cable runs, the superiority of fibre is also more debatable, but in the long run the market will turn your way
I am not advocating for anyone to buy a Lumin DAC. In fact, I do not even consider it due to price. My max price for a DAC is $3k. My point on the Lumin is that I believe that their solution for streaming with the X1 SFP is the best. I base this on my experience with streaming using the Sonore OpticalRendu. I believe what I use, while the best I have owned, is inferior to the Lumin X1 streaming. In the future, I wish all DACs had the SFP so I can eliminate the OpticalRendu.
BTW - in my office I have the following switch. It hooks up my computer, TV, and other devices, including the Sonore OpticalRendu to my DAC. I have 2 of these streamers for 2 DACs. In the future, with a SFP compatible DAC I can eliminate the OpticalRendu and just plug my fibre cable to the DAC from this switch.
Amazon.com: Ubiquiti Networks Networks UniFi Switch 8-Port 150 Watts, White : Electronics (price seems to have gone up since I bought it)