@knotscott I am far from alone in this stance and indeed I wasn't even the first to post it (in other threads). Frankly, I don't come up with many of my own ideas (like Xerox, I get) but am good a building on the wisdom of others.
To me, it seems a poor design of an amp to not support various levels of input and indeed I have never had a amp that required more output than my DAC could provide. That said, I haven't tried a lot of DACs. I have a Chord DAVE and LOWERING the output voltage of the DAC is a recommended way to combat harshness in your system if you have that problem. The Chord Qutest actually has switchable output voltage and I have used it on the lowest setting with no problem.
The one group who is consisitenly fully supportive of the preamp, and often emotional about it, as you appear to be, is the group of people who have invested a large sum in a preamp.
I'll close by saying that we are saying the same thing, you just want to dress it up by saying the coloration is "improved performance". Ok. That's your definition. But any preamp, except possibly a passive preamp, especially a transformer based passive preamp, is going to add it's own color to the signal. It processes it just like an amp. Every amp sounds different, every preamp sounds different.
I'm glad you like your preamp. I prefer my sound as naked as possible, as close to what was recorded on the original tapes as possilbe.
Jerry