I am a bit behind the curve on these digital stuff, I perfer analog, and I only use one input for my digital equipment. Why would you need four digital inputs? Do they all sound differently good, or one sounds better than the others? If so, then you would only listen to that one best input all the time, right?
But in any case, to fit more inputs jacks into a AVA chassis probably wouldn't be enough room to put all the control on the front panel.
I don't see it as a negative post at all.