To address your basic question of why people are spending so much money to achieve "perfect" streaming, my experience is that they don't need to.
I stream through an Asus gaming laptop hooked up to my PS Audio DAC with USB. I have ripped my CD collection to uncompressed FLAC (over 4000 discs) and I subscribe to Qobuz. I still have all my CDs. I have compared the same title/version of several CDs in my collection with the corresponding title on Qobuz through the same DAC (using a PSA transport). I would defy anyone to tell the difference between the two in a blind test. As far as I can tell, I have already reached "Perfection." I wouldn't expect the Qobuz version to sound better than the same version of a CD played through the same DAC. So far no one has explained to me why a digital WAV file would sound better after being converted to compressed FLAC, put on a server, transmitted over the internet through thousands of miles of wires and thousands of switches to a streamer, and then fed to the DAC. Where in this chain would you expect the digital information to improve compared to spinning a disc on a high quality transport and transmitting the WAV signal to the DAC through a short cable?
I've also compared my ripped FLACs to the corresponding CD (again through the same DAC) and found that the FLAC versions sound identical to the CD.
I am seriously skeptical that spending $8K on a dedicated audio streamer will make Qobuz sound better than the same CD played through my system. If someone has truly compared the two sources and found that the streamed version sounds better than the CD (through the same DAC) I would like to hear from them. I would be particularly interested in results from a blind test that confirmed that an expensive dedicated streamer sounds different than a garden variety PC. I'm thrilled that my humble PC/streamer setup can equal the SQ of playing the actual CD. I consider that a technical miracle.
One more thing. I normally stream the highest resolution version available on Qobuz so I stream a fair amount of 24/192 and 24/96. I consider this another reason to pay the subscription to Qobuz - I have the opportunity to hear upgraded/remastered versions of many of my favorite CDs. As often as not, the remastered version sounds worse than the original CD.