From the ASR forum, I stated, unequivocally, that equipment should be heard in a system in a room to determine a purchase. Regardless of the test measurements. Test measurements in sound only get one so far (ASR/Amir’s golden standard). Hearing is the platinum standard (me). Everyone has different music preferences and hearing capabilities (the physical and the learned from none/novice to experienced/golden ears). Knowing that, even if the measurements are the same, there generally are sonic differences one can hear and prefer.
I prefer tube amplification and multi-driver dynamic speakers in my room and system. The equipment is not perfect as tubes incur higher distortion than solid state (generally) and multi-driver systems have their own problems such as time alignment, phase shifts and dynamic compression.
@kota1 knows this and amply contributed to the ASR forum. I choose/chose my equipment, cables, tweaks based on hearing them in my listening rooms, not because they measured well or at all.
However, the query remains as to why don’t manufacturers supply their own test measurements and depend on reviewers?
Knowing measurements of the equipment I own, borrowed or owned "may" have helped eliminate some wrong choices in the past.
My audiophile friend who is also a car sales manager of many decades reads car test measurements and comparisons with ample scrutiny. He gave me an example today that in one review, one sports car had 600 horsepower and the other 490 horsepower yet in a race, the 490 always beat the 600. Why, well what was left out of the review was that the 490 car had one ton less weight than the 600. Could that have been the reason? Probably.