I'm not denying it measures well. Lots of sources measures well, but sonically it could be different. This is subjective I know since it's not measured objectively, but we cannot close ourselves of other variables that are not aware of that cannot be perceived objectively that adds to the sonic difference. If you look at it, the sound measurements for headphones has not been perfected yet, Sean Olive is coming up with a new way to measure headphones, so lets keep our mind open.
The S4 measures well with 1.2 output impedance, and to me it has wider sound and with neutron it's clear sounding(probably more warmth although the graph is neutral). Fiio measures well with the lowest output impedance possible, but to my ears it sounds less natural or less analog.
If we limit ourselves to what knowledge, we can possibly limit your self to possibilities. we might be missing out on lots of things that we are not willing to try and would enjoy. I agree it's good to be skeptical to keep things in check, but it's also helpful to have an open mind.