I have both an Audiolab 6000CDT and a Sonore ultraDigital/opticalRendu streaming stack connected to the same DAC. The transport is coax connected and the streamer i2s
The transport was $500 and the streaming kit approx 2k
If the file formats are the same, the playback is very close in SQ
Most of my CDs are 16 bit/44.1kHz
Tidal and Qobuz offer many additional file formats with less compression and higher bit rates, up to 24-bit/192kHz
For example, when playing the same song at 16 bit/44.1kHz from the transport and streaming it at 24-bit/192kHz, it's not even close - I'll stream the high bit rate file every time
That tells me the question is less about CDs, transports and streaming and more about file formats
Thus IMO the beauty of the streaming services is all of their remastered material in file formats that exceed 16bit/44.1kHz
Secondarily I do not have to repurchase my favorite CDs at the higher bit rate, if they were available, it comes with the streaming service
If in the future an old CD is remastered, again you don't have to go buy it. It's just added to the streaming library and you'll see it the next time you search for that song or album
If a new and improved format is adopted, you'll be able to stream it without any additional cost, where in the case of the transport you may need a new one that's capable of playback in the new format
What I do not see as a streaming option is SACD or DSD file formats
Which again takes be back to the differences in file formats, not the difference in transport vs streaming
Lastly the convenience of streaming better suits my lazy nature
The amount of music and the number of artists I can enjoy in an hour streaming, far exceeds what I can accomplish in an hour searching for and swapping out CDs
Happy listening and enjoy the journey