... that they mentioned issues on the older ones.
Why don't they comment on a products noise and other real world issues?...
This business runs different. Any reviewer writes for the manufacturer, not for the customer. They don't want to write something negative (and they don't hear it anyway).
The normal way is to write something positive about a given product. When the manufacturer does an update, for example a new high frequency chassis, THEN you can read that the former model was aggressive in that area.
When you have still have the former -old - review you will never read something about that "problem", all was great.
A kind of deafness is mandatory in this business. There is only one rule (only one!): The next is always better.