This is a very timely topic for me as a I recently purchased a single box cdp and dac (Luxman D-06). I mainly stream music through my Sonos system. I find the convenience unbeatable, though the sound quality is questionable which I intend to correct using Empirical Audio's Synchro-Mesh reclocker. The reason why I purchased the Luxman was for pure convenience. I dont like having to wait to rip new cds then update my library before I can listen.
In terms of sound quality comparison I do think it does take a very good player to compare to a digital only setup. In the past, I have had Esoteric cdps which to my ears sounded better than most of the digital only systems I have heard but was mainly due to technology such as reclockers and USB/SPDIF converters not being as good as it is now. At the end of the day this hobby is all about works best for you!
In terms of sound quality comparison I do think it does take a very good player to compare to a digital only setup. In the past, I have had Esoteric cdps which to my ears sounded better than most of the digital only systems I have heard but was mainly due to technology such as reclockers and USB/SPDIF converters not being as good as it is now. At the end of the day this hobby is all about works best for you!