here is a Stereophile article about the highs and lows of Blind Testing.
https://www.stereophile.com/features/141/index.html
personally i have zero interest in blind testing as tool for system building.
but i have plenty of experience with doing it. and it’s very flawed as a process.
for 20 years i have been a judge in a speaker building contest every other year with our local audio club. there are 3-4 judges and a curtain is set up and the speakers are set up behind that curtain. we have a sheet where we keep score and run through some cuts.
for this event it’s maybe the only process. i can tell you that listening to 8-15 sets of speakers will give you a headache. you are in a forced hearing situation so you are not allowing the music to come to you. how you feel about the music has to be ignored.
i would never choose that for my own decision making. i want to be relaxed and allow my mind to settle without any stress and get to my zen state, then i start to pay attention to what i'm feeling about what i'm hearing. if there is an unknown in the chain that fact takes away my complete concentration and ease.