Before the pitchforks and burning stakes turn up, I think it’s fair to say that there are compromises in trying to fit everything (digital front end, analog preamp, power supply and power amp) into one box, otherwise there would be little or no point in separating them out into their separate boxes for best performance. It can be noisy putting everything close together, and it takes real skill in designing such all-in-ones to perform well. Something, luckily, that Naim have got very good at. But even at their best, separating things out will invariably bring performance gains.
In the case of the Superuniti, just try it up against something like a NAIT XS or Supernait or even a NAC152xs, NAP155xs, and Flatcap xs and an NDX or ND5XS and you’ll see what I mean.