I think the second type videos as Romy defined them are pretty useful, just a nice Showcasing of the gear to see what is out there, how it looks and well, sound does come out of it! Just say good things about the set up and move on.
It is like a car showcase, they show mainly the car, running fast, but you never know how fast, and maybe just a couple of data: 0-100 km/hr in 3.4 seconds. They will of course not show the under side of the car or make a closeup of the fuel pump! And even crappy cars get a nice video, look beautiful cheap crappy car, it runs nice and there is a nice girl on it!
I think it is a great idea! No it is not a review, nor is it a technical descrption...
Trying to get and idea of the sound through the video would be like trying to get and idea of how a car handles by shooting a video of the car running.
There is a time and a space for everything and this covers superficial very nicely!
Want more info get a white paper.
Most Show videos are made with no preparation, maybe only some quick light fix, like please turn those on or off.