You hand waive and generalize a lot, but these explanations are not legitimate to prove your claims.
No one can prove subjective impressions right or wrong.
Even if 100% chooses the same as preferred in an ABX test, this will still not prove them right, that´s just marketing.
To be able to hear the difference is another thing.
What I´m saying is, that you can experience differences in sound, in spite of premium measurements in both cases.
Try it out yourself.
Get an ICEPower 1200AS2 and compare it with i.e. nCore500OEM, and listen if they sound the same or almost.
I did not expect them to sound different, or if I somehow did anyways, then I expected the nCore to be the one of choice.
Btw it is a well known thing, that bridged amplifiers change their sonic character compared to half bridge equivalents.