Both these guys have high quality CD players and have also invested in a high quality external DAC. Both like to explore music and have several hundred plus CDs.
One guy Gus, decides to buy a streaming device. He buys a Bluesound Vault. He starts to rip his CDs to the HD in the vault because he wants to back up his CD collection. Now he has a near perfect FLAC file of each of his cherished CDs. He decides to listen to Tidal, Spotify and various other music service platforms that his Vault allows him to access. Now he hears albums he would like to own. Some of these CD albums he buys and some he finds at his local library and he can keep listening to these new CDs on his CD player but now can also get a bit perfect copy by placing them in the Vault. If he sells his cherished CD player and buys an updated DAC, he can connnect that DAC to his Vault to take advantage of the new DAC while listening to both streamed music and his Vault copies.
The other guy, Glen keeps things simple and continues to enjoy his CDs.
No problem with either situation at all. But music and technology
allows us to explore and that can be fun.