Are there a substantial number of well recorded performances recorded on CD which can’t be found via streaming services, or where the streaming version is sonically inferior to the CD?
Unless you have a large number of rare CDs the answer to this is probably no, but there will be albums that you won’t find on your streaming service.
Technology continues to improve rapidly in both the CD and streaming formats. Which one will eventually sound best is hard to know. Streaming has the advantage of hi-res formats (96/24, 192/24 at present). CD is always going to be 44.1/16.
The great advantage of streaming is that you have access to millions of albums. I love being able to find great music I’ve never heard of. Most of the apps you use to control your streamer suggest new artists based on what you’ve already listened to. I use roon (subscription required) for this and I love it.
Streaming is the future. It already provides about 85% of revenues to the music labels. CD could make a comeback but there’s no guarantee of that.