The magazine industry in general is in decline. The audio industry in general is in decline. Combine the two and you have a set of magazines with no budget to be 'championing'.
Reviewers do not go the extra mile anymore as the amount they earn hasn't really gone up since the mid-1980s, due to those declines and because writing is no longer considered valued. I stopped reviewing multichannel loudspeaker systems for home theatre magazines when I worked out that the amount of time spent opening the boxes, setting the system up, listening to it, writing that up and reboxing the equipment meant I was earning about £20 per day. If I then contacted the manufacturer to get an inside viewpoint on the design of the loudspeaker system, that might add an extra day or two to the whole package, lowering the rate still further.
It used to be possible for magazines to assign in-house staff to do the investigative work, but that was when magazines had in-house staff. My magazine's editorial department is a team of me; others have more, but the more editorial members they have the more review writing those editorial members do to save money. So, all those championing bits of investigative journalism have gone away.
This is somewhat different from the situation in other countries. Germany, Japan and China still have vibrant audio industries and the amount of money spent in advertising and received from circulation means the reviewers can be paid enough to investigate the products thoroughly, and there is an audience receptive enough to receive balanced reviews. Here, I'm still receiving mail from readers who are disgusted that I have introduced a dangerous level of objectivity into reviews by discussing chipsets instead of simply stating that products are 'magic boxes full of precious things'.
Yes, we do preselect, although I am less inclined to do this. I prefer more objective writing, and that includes the good and the bad. We are living through a very grey time in a lot of audio now; few things are remarkably good or bad, most are 'meh!'. Unfortunately, this doesn't make for an entertaining magazine, as it seems most readers want raves or annihilations... so we chose to filter instead.
We live on 'Clarkson Island'.