Most of the new CDs I buy come from Amazon and about every fifth or so disk is part of their Amazon Music program. In this curious animal, your CD automatically appears in your online account for streaming and potential download as a MP3 file.
So while I am waiting for the CD to arrive, I sometimes stream the advance copy and get a feel for the new listening style. Here's what I have found.
Something strange in Amazon keeps the file order unpredictable so the stream will not always move from track to track properly. There are, as well, numerous clicks and pops as part of the streaming network process -- usually at least one for every track.
When you download a MP3 file and compare it to the stream the download sounds better -- clearer and more precise (even though they should be the same).
Then, when the CD comes I rip it into JRiver and upsample it to the DAC with SoX. The sound quality is so much better that it always reminds me: MP3 really sucks but its faults are particularly evident when you compare it directly to a CD wave file.
SO, despite the continual pressure from the forces behind the Spotify/Tidal crowd I do not find streaming the same quality as CDs well done and think it is another case where the philosophy of "almost as good" is being sold to the public.