So we have an iMac with Catalina running that we are streaming music from. All 1800 CD:s are ripped there in Apple Lossless so we at least could stream in the same quality that the music was bought in.
Before when using Remote application on any of the family's iOS devices we had the benefit of not handling the actual files (significant larger than compressed formats, e.g. 10 times) only telling "iTunes" on the iMac, where to play and at what volume for each Airplay speaker.
If using iOS "Music" and home sharing feature, we either need to stream the actual file from iMac through the device and stress network and sluggish response as a result of large files and library. Second possibility is the stream compressed copies from the "cloud" and stream to speaker.
Neither of these choices are acceptable - We need an update of Remote for iTunes so it works with new Music application running on Catalina or just to add decent remote function through iOS Music!
As Apple claims to "Love music" and sees themselves as an innovative company with focus on making things nice and simple to use - I feel they missed out here. Maybe need to look at other solutions like Sonos, Roon...
While we are at it - Apple could (or should) also add the possibility to control Music running on one computer from another one e.g. iMac as server and MacBook Pro as client (not using "Shared screen") ;-)