I beg to differ.
I have a Yamaha AX-596 integrated amplifier and a Beresford DAC 7520. One day I decided to play around with my amplifier's ability to be separated to a pre-amp and an amp.
Since my DAC has a volume control I connected it directly to my Yamaha "amp."
I could not believe how much better the system sounded. This newer setup revealed inner detail so significantly that I could no longer go back to my integrated setup. With this change I also lost the remote capability of the amp ( the volume control on the Yamaha was now useless) and all of yamaha's analog inputs (Tuner, CD, Tape etc.)
What I lost in convenience I more than made up for in acoustic pleasure
CD