I think that's a pretty damn good circuit analysis, and it makes good technical sense. Compared to that nonsense on another link you posted from Benchmark about digital inter-sample overs, this one is excellent. I suspect the circuit differences they describe result in fully measurable advantages, but the real question is, are they audible? My guess would be that with the ATI3000 amp I use, on the balanced inputs, which have a gain of 28db, the answer would be maybe. It would be nicer to have more output than 2.4v if you have inefficient speakers in a very large room, and you like to listen at high volume levels. Otherwise, I doubt it.
I use a Benchmark HDR as a preamp-DAC in my music system, and it does run hot. It's unlikely a pre-pro designer would allow himself so much power dissipation and heat for so little circuitry, not to mention a bunch of expensive higher-voltage components. There's some logic to that blog post. For someone like me, yeah, I dislike cheap circuits enough to spend money on things like Benchmark preamp-DACs. To someone else, I could understand if the conclusion was that it wasn't a compelling argument.
