I reject the claim that the Integra 9.8 or my Yamaha Rx-V1700 that I use are inferior pre-amps, to a dedicated pre-amp, used in multi-channel application.
In my system I hear details like the tube power from the organ in ELP- Show that Never Ends, I know the resolution is very good. I can't imagine how lets say the SP3 can improve on this, though it probably will.
I think 2 channel enthusiasts are not aware of what can be done with these av/receivers. You have Bass Management, Parametric equalizer, Graphic equalizer, Auto Room correction, Speaker size, Speaker distance, Time delays, Tone control.
Yes, in 2 channel stereo mode its probably inferior to a dedicated 2 channel pre-pro. In multi-channel, with parameters adjusted to room conditions, the sound can be better than 2 channel die hards can imagine. 
I have to completely disagree with you here.
There are so many issues I don't even know where to begin.
First off, I don't believe the room correction in any of these mid level HT receivers or preamplifiers is really any good, and likely do more harm then good ultimately. In my opinion I found that treating a room properly nets much better results then using the room correction, and I now prefer to run with the room correction and EQ off when I am watching movies.
The other issue is, if you are using the room correction, tone controls, etc, etc, etc, you have to use the built in DACs of the processor.
If you think that the DAC section of your Yamaha beats out a well thought out dedicated two channel DAC; this discussion can't continue because obviously our expectations are drastically different for performance.
Outside of what DAC chip is used for the decoding, there is input, output, power supply, etc, etc, etc; which some consider even more important then the DAC chip itself.
Continue to compound that with these HT processors being a jack of all trades cram boxes, you have a video processor, network streamers, sound processors, etc, etc, etc, crammed into one box using a singular less then stellar power supply.
There is also mildly par quality in these things in regard to input connectors, and speaker terminals, etc, etc, etc, etc.
Everyone wants to think that dimensionality is the key to musical reproduction; however its complete nonsense. Its just one parts of the puzzle.
A good two channel set up can give you an excellent front stage (where the artists actually should be playing), depth, width, sense of space....
It can also give you supreme microdynamics, dynamics, transient speed, and realistic timbre that I have yet to hear from a HT processor of any kind....