I’m hesitant to link back to reddit, but I’m not sure there’s any community with quite the same amount of engagement/content yet. They have rules against number of views/plays to try to keep posts about lesser known stuff.

https://www.reddit.com/r/listentothis/

The few things I liked about siriusXM when I had a subscription were alt nation (except Madison… ugh) and XMU. The DJs occasionally had insight into their choices but you can find the playlists themselves here

https://xmplaylist.com/station/siriusxmu https://xmplaylist.com/station/altnation