Yes the only thing that matters is the SINAD coming out of the binding posts of the final amp in the system. That result will be identical from the binding posts of the Purifi or Benchmark AHB2 regardless if the $20 Meizu or the Okto DAC was used as a source.
I'd like to see the test, just to make the point. A Purifi and an ABH2 hooked up to a steller vs merely fantastic DAC, and measure the output.
What this DAC lacks is room correction.
Is it still possible to get the Dirac laptop software?