My point us simple - we can not rely on measurements, performed at 0 dB FS. They are too close to the level of clipping
What you seem to miss is that when a sinus of 0 dBFS is calculated (for testing a DAC) this signal has no higher intersample values.
and even a good “passing” unit can give us bad results due to different type of fluctuations. We also can not approximate such results for the same product, because tolerance in components can make it either passing or not.
Nielsen proved that 7 tested by him players perform really badly being tested at 0 dB FS. Are they all “bad players”? What if the same player will have enough room (again due to tolerance in components, for example) and pass?
This paper examines the sonic consequences when 0dBFS+ signals are reproduced in typical consumer equipment. The performance of a variety of domestic CD players exposed to such signals are presented and evaluated.