I don't agree. What you propose would be the test "are you able to tell the difference between the compressed and the uncompressed sound when you compare them d

I don't agree. What you propose would be the test "are you able to tell the difference between the compressed and the uncompressed sound when you compare them directly"? While this test is "are you able to appreciate the difference between a compressed and an uncompressed piece of music"? If the two seconds it takes you to switch from one version to the other are enough to prevent you from spotting the difference, I'd say that whatever difference there is is likely to be irrelevant to the listening experience.