Nothing is perfect and equipment owners, equipment manufacturers, and professional reviewers all display forms of cognitive bias when writing about products. None are absolutely objective and none will exactly mirror the reader's own sonic preferences. WRT equipment owners posting in audio forums, it is not unusual to observe choice-supportive bias and confirmation bias as they promote their own equipment choices. For me, the expectation bar is to learn a few things and be entertained but certainly not to make purchase decisions on the basis of one or even two reviews.
With professional reviews, I appreciate well-done pictures and right now nobody tops 6moons and the pictures they post of the insides of the gear they review. I have always been skeptical of gear that "can't be opened or you void the warranty." Would you buy a car without looking under the hood? I also appreciate reviewers who compare the product being reviewed with
similar products (i.e., differences in sonics, operational features, and construction). Again, Srajan at 6moons typically does a good job of this.
Regarding reviews here on Audiogon, as someone already pointed out there is a place here for reviews so a good start might be for the folks here to simply write more reviews of their gear and post pictures on their system page.
https://forum.audiogon.com/topics/member-reviews