In my system (high resolution, with electrostatic speakers), I've compared Roon to a simple DLNA setup, both running through an Auralic Aries G1. I get excellent sound either way.
Years ago, Auralic made firmware improvements that put Roon on parity with their own software in playback through their equipment. There is no intrinisic reason that Roon can't sound great.
Many audiophile reports of "noise" turn out to mean simply that one thing is preferred to another. This is almost always with sighted comparisons and not attempted blind. Preference may be due to expectation bias, heightened attention, or favoring something already owned. I would be wary of subtle differences (even if reported as "major") that have zero objective measurable component. Not to say that they can't exist; just that as humans, we fool ourselves easily and often.