Fair point, but even that is not totally true, at least not for the newer models. The thing is, you can't beat the scale of economy thing, so even some near $500-$1000 (example Yamaha's) integrated amps, and of course stereo receivers as well, use some of the same ICs (yes, even some of the same ICs used for 7 channel AVRs) for things like switching, volume control, and protective schemes etc. It is not really a negative, I just mention it as a matter of facts.
DAC chips are typically not the bottleneck, but since you mentioned it, I can tell you that I cannot name one single 2 ch stereo receiver or integrated amp in the <$1000 range that offers a better DAC chip than the AK4458 in the AVR-X3400H or the ES9006 in the RX-A1070. If anyone can, please do..