Yes for 99% of the time a quality separate amplifier is of much higher quality
then a low cost class d amp in a active speaker
I wonder how long it's going to be until we start to see GaN Class D in active self amplified speakers? GaN is surprisingly good already. I have heard the LSA Voyager GaN 350, I must agree that it's good, for the money it's very good.
As DAC chips get better and GaN amps also become more refined, the playing field may start to change goal posts, who know?
OP - I wish I could run VitOS on my music server to compare with what I have, I wouldn't be surprised if it bested what I currently have. WinServer 2012 R2 in core mode with Audio Optimizer, Fidelizer Pro with Foobar 2000. (I haven't nutted out how to get my Jplay Femto going yet).