Not true.............actually the coaxial SPDIF digital input from a DAC , if utilized, can be superior than USB. There is a relatively new product that exceeds the sound quality of USB. Its a converter that is placed between the USB output of your PC and your DAC SPDIF input. There are a few audio manufacturers that produce them like.....Musical Fidelity's V-Links II, Stello U3, and Berkeley Audio Design's Alpha USB to mention a few. Prices range from $ 200. to $ 1700.
The USB input was never intended to be a high resolution digital audio output. It was the rapid growth of computer based music systems that caused the high end industry to re-engineer the standard to meet the growing demands of high quality music requirements, Because of the contributions of high end designers ,today's best USB interfaces are light years beyond the basic improvements.
I would just like to mention that another level of higher audio quality sound from the Essence One is possible, depending upon your personal audio system investment and audio playback quality preferences, these USB / SPDIF converters may or may not be everyone's desire to acquire for more $$$$. Thou it is an option. Just to inform you.....