Your making a point that "how come musicians can enter a crowded room full of equipment and within a few minutes be in total agreement about which units have the best sound" I don’t agree, and in comparison to audio equipment I think a crowd of musicians picks out a group of the best equipments in the room. But, still yet they individually favor one piece or the other.

I don’t see how anyone could say there is one best amp. One best speaker. Everything has a different sound or tone, not to mention every person hears differently. There’s lots and lots of great equipment out there.

It's my speculation that the musicians are quickly satisfied because they are 'producing' music and the tone they want is exactly what they are producing at that time in the moment. It is what it is, and that's exactly what they want.

Audiophiles and reviewers are looking for what they think or perceive as a perfect reproduction of what the musician played. It's not possible. They cant do it. They were not there when it was produced.
There’s just no perfect reference to compare.

Would it be close if you set up different systems in a recording studio. Right in the same room people played and compared the reproduction to the production? Only if your 100% sure there is no degradation from the production to the reproduction considering: mics, cables, recording equipment.

Why don’t you hear of musicians spending $5000.00 a meter for a mic cable or a guitar cord?