If you haven't done this already I would suggest that you compare a streamed album with one that you have ripped in FLAC. See if there's any difference in sound using your current setup.
In my case I have ripped my CD library (over 4k titles) into uncompressed FLAC but I still have all my CDs. I am streaming through an ASUS gaming laptop (I7 processesor) into the USB input of my PS Audio PerfectWave Mk II DAC. Note that the DAC has a "Digital Lens" feature that buffers and reclocks the data which should take care of any digital hash from the laptop. I also use Qobuz.
I have compared several CDs with the FLAC ripped version as well as the same version on Qobuz - all through the same DAC. The CDs go through my PSA PerfectWave Transport. I can't hear the difference between the three formats. They sound identical, or at least similar enough to not make a practical difference.
I wouldn't expect a FLAC version of one of my CDs to sound better than the CD itself. Using this criteria I can't see how an expensive dedicated streamer will help me. The other advantage of using a PC is that it can serve as the Roon core when I go with Roon at some point in the near future. BTW, the Qobuz version sounds the same as the other two formats which is to say that they all sound very good.
To put this another way, is anyone saying that a FLAC played through an expensive streamer actually sounds better than the corresponding CD played through the same DAC? If so, that is a demonstration I would really like to hear.
I read folks saying that an expensive streamer sounds way better than a cheaper option but I never see them using any sort of reference to help pin down the differences. I really think that you have to compare against a reference to get an accurate picture of how much difference there really is.