I am familiar with these YouTube videos. I actually play them a lot during the day as background music & have saved a few to my favorites. I run my TV thru a Dac into a 2.1ch system in my living room. When my dac gets the signal from YouTube the highest quality I ever see is 16/48...normally 44.1khz. Even if the resolution is lower than that my dac will still show 16/44.1. 16/48 is still pretty good and very pleasant but I wouldn't put it on the same level as Quboz or Tidal. While some people may not even be able to distinguish between best quality YouTube Music & Quboz I certainly don't feel Quboz or Tidal sounds inferior to YouTube.
In my living room with the TV I have a Primare Prisma NP5 with upgraded PS, one of the better budgets streamers I've tried (& I've tried a bunch) but it's not of high end status...& I can tell the difference between the TV app & Quboz. Blacker background, better imaging, etc. Now I really do enjoy those certain YouTube videos & the quality of music but it can't replace my streamer. Not to mention that a lot of the music in those videos are something I don't always want to listen to. Sounds great though..I have one playing right now. I can understand why you enjoy it.