Not every opinion is the result of bias.I appreciate your post cleeds but i will make a precision...
Every opinion become a bias, but all opinion are not unfounded orientation of the mind or useless and meaningless habit, some opinion and unconscious bias are motivated by learning and listening, or any slow acquisition of knowledge...
All biases are prejudices but some prejudices are more meaningful than others.... Call them informed orientation of the subsconcscious and conscious mind...
Then pretending using blind test to reveal bias in the sense of unfounded and meaningless habits that oriented our choices is very delicate because there exist also bias that are meaningful and founded on real meaning and knowledge process acquisition...
Then the range of application of blind test is only ERASING the presence of ANY bias in a test for small change or for statistical methodology....
Not for proving that the taste for stradivarius is meaningless and non sense habit reflecting only arbitrary bias like the taste of a supposed deluded audiophile....
Erasing biases from an experiment CANNOT prove that the biases eliminated were all non sense choices or deceptives one EVER to begins with....This is science fact.... The other interpretation is cheap scientist ideology ....
Blind test are useful not for PROVING anything, it is ONLY a tool to eliminate human choices for statistical reason....
Any other use is childish epistemology.....Or epistemology for fanatic.... Pick you choice....