But depending on your phone,
Less chance of quality/packet loss than analog or SPDIF (that's probably a lil' OCD).
Interestingly shaped 5V DC charging port; almost like HDMI.
My phone has Bluetooth 4.1 and the device I linked to is 4.0 so the sound should be OK for general listening (no lossy audio codec tests). I am aware of the quality loss with Bluetooth (although I hear with 5.0 it's near lossless or something like that). The Bluetooth to Optical device I linked to is $70, was hoping for something cheaper since Chromecast is $35.
What we can hope for is for the BT SIG to come up with an updated A2DP that takes advantage of the new BT LE throughput capability which it seems to be good enough for quality audio transmission, when before (BT 4.x) it was probably too slow. It wouldn't make it better quality... but it would be more power efficient.