That is a great video that a lot of people need to see. There are just too many things that affect how a piece of equipment will sound in your room to have just one measurement be the only consideration.
I think humans do not like complicated situations and want to simplify everything, and that is why something like SINAD is easy for people to jump on as a silver bullet and ignore everything else. The idea that manufactures would change their process to make the device measure better in spite of the fact it would result in a device that does not sound as good makes me think of the loudness wars that did more to destroy the sound of recordings in the pursuit of more sales than any other event I can think of.
I found the bit about a gaming PC being the noisiest source you can use interesting, since I feed a DAC from my computer. I would like to hear more about that topic, including what the better solution might be.
Thanks for the video.