What if I like 2.8% distortion? Sure, we can measure it, but the engineering goal of lower is not the same as my personal listening goal of making things that sound good to me.
If you prefer 2.8% distortion that's fine and dandy.
Who knows, on certain music and certain genres I might like it too.
But then again what if this 2.8% distortion is always audible, on all music?
What if this sometimes nice distortion on some recordings then turns into nasty distortion that you can't 'hear through'?
Perhaps the strongest argument for neutrality is that you get to hear the differences in different recordings rather than them all being smothered in the same sonic sauce.
I recall that of the criticisms of the Linn LP12 was that it put it's own sonic signature on everything that was played upon it, as opposed to decks like the Pink Triangle which were far more neutral.
This sonic signature (midbass warmth?) could sometimes suit certain types of music (jazz soul and funk?) and sometimes spoil others (piano, strings, pop, and rock?).
I was again reminded of this whilst watching the latest video from the audiophlliac himself, Steve Guttenberg, who recently changed his reference loudspeakers.
One of the reasons Steve puts forward for swapping his Klipsch Cornwall's for the PureAudioProject Duet 15's is exactly this issue about neutrality.
Even if the Cornwall's do other things better, the more neutral 15s allow you to hear the differences between recordings better.
The problem with audible distortion is that there is no such thing as an entirely benevolent distortion in all cases..