Yes, absolutely, when the visual element has been removed from the equation.

Nobody's knocking it, ol' bean, but I've tried it and have heard no difference. In fact, the only time I've heard differences was when I suspect I wanted to. In a subsequent test, there was no difference. Wire is wire. Period.

I haven't read your links, but DBT is an essential procedure for any meaningful results in any sort of evaluation. It eliminates any sort of bias. The whole business of questioning DBT originated when John Atkinson of "Stereovile" did a DBT and found to his horror that he couldn't tell two amplifiers apart when he knew one to be better. So, instead of the obviously correct conclusion, that they really did sound the same, he concluded that the test was flawed and then had to dream up an absurd mythology to back it up.

However, as I've said, if folk want to believe in things that aren't actually there and if this enhances their enjoyment of the music, I have absolutely no problem with that.