That`s not true. Well, maybe that is partially true, I`ve never owned any Fiio (maybe it`s cheap and good and do everything - I don`t know), but I remember USB-related problems in expensive products. Burson had problems with USB inputs in their Conductors. After some time they came up with a solution based on CM6631A (the same is used by Schiit). Violectric had some kind of problem with USB-inputs (I don`t remember what exactly, but they made an XMOS-based upgrade). Chord Hugo and Hugo 2 do not have "galvanic isolation" on USB (they have this option only for 2qute and Qutest). That`s only what I remember, sure there are more examples. All those DACs were not cheap and they had problems at some point. And those products still are very good. Actually, I believe that USB-power noise was industry-wide problem few years ago and everybody was working on this problem in one way or another.