I have a $300 oxygen free copper coated with silver, cryogenically frozen down to -300c for five days, which will be made useless by this. this cable accompanies by $1500 headphones, Westone W80.
and here's my problem. the headphone jack on existing units is actually smaller than the micro USB and USB C ports. the USB C port and cabling also is flimsy, and twice the width of a headphone jack. I would not want to be using it for headphone audio under any circumstances. I can picture any type of DAC/USB C adapter being quite large and possibly destroying the signal by the time it gets to my high quality $300 cable.
then you have Bluetooth which transcodes all your audio into lossy formats destroying the audio even more. they do many a Bluetooth cable for my headphones but the audio loss of AAC/apX is quite large over a lossless signal traveling over my cryo cable.