"One thing I don’t understand is if I wanted to switch to say tidal and import my playlist from Qobuz how does a high rez song from Qobuz remain the same high rez song from Qobuz when it goes to tidal?"
Qobuz has a global setting (inside the software in your profile setup, I believe) where you specify the resolution you prefer when listening via wifi or mobile. Tidal will have the same setup, I would think. So when you transfer from one service to another the resolution preference you set up in the software will determine the resolution of what you hear, given the resolution the music is available in. Tidal doesn’t have one "version" of music while Qobuz has another. If you transfer your music to a non-high-res service, like Pandora or Spotify, then you’ll see a wholesale change to low- res in anything you listen to.
..and saving your list in a an offline format (XLSX, CSV, TXT..) eliminates the need for "streamer storage" and therefore the need for a new streamer with storage. If you want a new streamer, then that's a separate decision unrelated to backing up your playlist.