I wonder if botrytis realizes he has wandered into a blind alley. He has mixed up the concept of ABX testing by a panel for commercial sales with a home user selecting components for his audio system.
To put it in terms botrytis brought up- would he criticize a homebrew distiller for not using ABX testing on his product? That would make no sense. A homebrew distiller is making his product for his own personal consumption and so will of course brew it to his tastes. Would botrytis accuse him of bias for making it taste the way he wants? He added ingredients without blind testing to see which ingredients are the best? How dare he. Of course this is nonsense. The brewer makes his elixir the way he likes it.
An audiophile sets up his system to sound the way he wants it to sound. He is not setting up a commercial adventure to sell copies of his system to others. Therefore, to suggest that a person must do ABX testing of the components he selects or else he is just fooling himself is a ludicrous concept.
Here‘s a thought. Go into a high end restaurant and tell the head Chef that if he didn‘t ABX blind test all of his ingredients then he is biased and wasting money on expensive foods and spices for his meals. See how that goes.