I generally agree with you. However, if you look at the cross talk performance, the A90 Discrete has a solid improvement from -102~-105 of A90 to -113~-116. Though -102~-105 should be transparent, but it will be interesting to see if people can tell the difference as lots of people in hifi community claim that A90 has a relative small soundstage which may be related to the cross talk performance. I know their subjective listening tests are not controlled and not valuable at all, but I don't think it is scientific to deny all the phenomenons by saying other people are just imagining the difference and therefore no need to do tests anymore. This is mind laziness in the disguise of science, not science itself. Hence a proper controlled test between the two is interesting to have.At these levels of excellence it's transparent for humans. Select the one your prefer and forgot the other, or buy the 2 because it's your pleasure. But frankly speaking, if you are concerned buy the preamp question, you already have an A90, so buy this one to complete your collection.