We are in agreement I think. Useless? I don't know about that. But I know I hear what I consider a significant difference between cables and amps. However I doubt I could consistently and correctly pick out these differences in a DBT. Does that mean I am just fooling myself. Maybe. Does that mean the tests are flawed? Maybe. Frankly I don't care if I am fooling myself or there is a real difference. If it sounds good to me then I'm happy. And it's money well spent.