To get objective data cheap a Klippel is needed, as Toole confirms. If the Klippel is still too expensive (it is just 100k, so way cheaper than a single box from premium manufacturers), o/k, it is too expensive. Then the ears come into play. Standards are needed. So Danny invites to his room. And he clearly admits indirectly, that all this is about his own focus, aka taste. He and his room are the standard.
I don't think it is arrogant, but reasonable instead. The situation just reflects the 'market', as it is (still) today. Millions of people every week confirm this by buying along that guidelines. Didn't You see even here designers treated as genius, despite mediocre Klippel data, and clear violations of best practices, refusing data?
Hilarious the high-end blah blah is, no doubt. I can't stand it and also wouldn't buy.