I don’t think you’re missing anything unless you’re accidentally doing some normalization during the rip. I haven’t noticed a huge difference between ripped CDs and tracks from Qobuz, but you can always use volume levelling. I use it with my office setup because I shuffle a large playlist and it works great.
Hi @Antonis_Anastassiad1, and welcome to the Roon forums. One thing that you might be missing here is the certainty that you’re listening to the “same exact track”. Your CD rip may be a subtlety different version or even a different mastering altogether. Comparing contemporary recordings where few variants are available is one way to mitigate this.
Edit This got me thinking/reading a bit. These are both interesting articles that give some background.
The prevalent worry is that your mix will be too loud, and streaming services will reduce the volume. Little talk of volume increases, if any but that’s not a definitive answer. There’s even a tool to check whether a track will be affected: