I find these tests make everything sound the same to me (when I think the differences are not night and day :-)), so I no longer rely on them at all for myself.
eg. Amplifiers, Dacs
Has led me to a lot better system that way. But everyone is different, so don't knock anyone else doing them.
I was building up my system many years ago and was buying some great gear. JR, Modright and many others and was loving how my stereo was sounding. Back then I got really interested in the Audio forums and what others where saying and doing with their systems. It was so much fun delving into this hobby for me.
One thing that seem to pop up a lot was about these tests and how easily you can be duped with sighted tests and the normal things like fools are easily parted with the money etc by what seemed like very knowledgeable people. Must do these tests otherwise you are fooling yourself. (In the end it might have just been very rigid opinionated people who made it their thing to post everywhere thinking they are trying to save people from themselves.)
I spent a good 6 months religiously doing these tests all the time and found none of the very expensive gear I kept buying sounded any better than my cheaper Emotiva gear.
What an eye opener!
Well this was super news to me. I could have such an awesome sounding system without spending big money. So I thought.
What happened was I sold the more expensive stuff (feeling super great I was not duped now) and thought I was now one of those people who now knew better too.
Well my listening sessions became way less enjoyable, to the point I no longer liked my listening to my system. Something was wrong. Bought more expensive items and thought it was a big improvement. Do the tests again with a new piece of expensive gear and again can't hear a real difference.
Then started searching the net for more info. Looking at lots of other tests people had done.
Well it looked like 99.9% of these tests online from others similar to me had the same outcome. No one could reliably pick the components in a blind test when the differences are smaller (like dacs, Amps etc). This seemed so odd. These devices really can not all sound the same? Can tests like this have such a perfect result? I could not fathom that these simple tests could have such a perfect high percentage same outcome.
Did more reading over the months and quite a bit from the Harbeth forums on blind tests, and then realized that these tests are super super super hard to get all the factors right, which in the end can lead to exactly what I heard, I could not pick a difference. These have to be set up so painstaking well, otherwise they become quite useless. I came to realize, that are not helpful to me.
Went back to just putting a component in my system and using it over weeks/months, and then trying something else etc.
Well my system starting progressing very nicely and I started to connect to my music again, to the point now I thoroughly enjoy listening to my system again.