Media containing so-called reviews are mostly motivated to make the reader want what they don't have, maybe not now but eventually. Curiosity leads to purchase, and the spending of money continues the cycle.
Marketing copy is the same.
Both rely on sales to fund new products to promote. Without new products hifi media would be out of business.
With that in mind, who wants to read negative reviews? Who would buy that magazine?
I would not be surprised if some reviewers write marketing copy.
The publishers know who pays their bills, and my guess is that is largely not revenue for sales of the publication, but from advertising in it.
A truly independent publication would not be affordable to readers.
Being aware of editorial bias will regulate how seriously to take the content.
For me, I like to research rewiews understand differences between products. I enjoy reviewers who make fair and honest comparisons, and that dont buy the products they just reviewed or advertise them.