"There is no value in upsampling".
Yes and no.
No: if it is just a DAC connected to a streamer as input and that provides an analog signal that will goes through an analog amplifier.
Yes: if it is a DAC or ADC that are connected to a DSP chain (i.e.: an AVR).
The DSP is a digital machine that will change the sound by alteration of each digital sample.
Smaller is the size of the digital sample (quantification), better is the end result.
The problem is that the DPS is working at the speed of the input ADC (for an analog input) or at the computer audio standard sampling rate (for a digital input).
So yes, we need an input digital oversampling at 96khz (ADC if analog input), a DPS working at 96khz and an output DAC running at 96 khz.
I am dreaming of such an AVR running at 96khz or higher, as room correction becomes a standard feature.
Alas, even if we feed the nowadays AVR with an HD digital source (some streaming are at a 196khz sampling rate), the AVR will run the room correction at 48khz!
In that case, for sure we will not hear any improvement from a CD quality (44.1khz).
If somebody has found an AVR that has a DSP running at a 96 khz sampling rate with any of the input sources, it would be interesting to get some user feedback.