That looks like a solid little DAC for a nice little price. Thanks for sharing.
Even a cheap dongle type will do a good/better job if you use it with an AVR's analog input, direct mode to bypass the AVR's ADC/DSP/DAC block.
This I don't think is quite so simple. It depends on what you're connecting it to. Not all modern receivers even keep an analog signal anymore and will ADC internally. Even if you do have one that does have a pure analog pass-through, then you're giving up any room correction as that also requires an ADC - DAC conversion anyways - or rather, I don't see the point of using the external DAC if you're going to end up using the internal for RC. You did specifically say integrated amplifier though, and those have traditionally not had RC in the past, but it is becoming a more common feature on them now.
I have one system where I run it straight analog from the DAC (because I wanted to preserve native DSD and just try it) and I am generally happy with the sound from the system. So no RC is definitely not the end of the world. It does make something a little more expensive like the new Topping D50 III with PEQ built in a compelling option for older integrated amps.