I think it's unfair to say 'deliver the SQ to everyone's complete satisfaction'. Why? Because we're not talking about definable, repeatable metrics when most of us say 'SQ'. We're instead talking about sound preference. And it's true: device A may not sound good to you, or to me. But that doesn't mean it doesn't deliver amazing SQ. It means that you, or I, do not like that sound; or it means that we love it. Love or hate, SQ largely has NOTHING to do with it.
If we were talk about SQ, we'd be talking about dynamic range, signal to noise ratios, and how closely the signal out of the device cleaves to the original, recorded signal.
I take issue with this because by and large, we are full of BS to think we know anything definite about SQ. It should be our prerogative to be honest: that we are talking about sound preferences, and there, not SQ, or in the chance that we can reference measurements, or benchmarks, about observable, repeatable SQ.