What people don't realize is that, at 100dB+ efficiency, every little thing matters.
Imagine your own system. That cable you tried that made the sound really harsh... Now imagine that on 100+dB speakers... Yeah, unbearable. Or that Class D amp that drove you out of the room... Yeah, try that on a 100dB horn...
So, it's all too easy to blame the AG and find some random fault with it, when it's likely just a matter of poor set up and/or poor component matching.
When we presented AG a few years ago, we had to run our phono stage at its minimum gain setting, and that was with a LOMC Koetsu, otherwise, guess?, it would be a little "too much". Once dialed correctly, everything locked into place, and even at crazy loud volumes, the sound was gorgeous.