Ah...I see what's going on here. A few things:
1) I'm using Bluetooth earbuds because I'm next to my wife who's asleep in bed. I just downloaded Reaper and wanted to learn the Reaper features and workflow by experimenting and watching some of the many awesome Reaper tutorials. I don't need the highest in hi-if for that.
2) While I don't believe you had anything but the best intentions with your response, you changed my question (and the OP's) about what appears to be an actual bug (Reaper is not configuring some BT audio devices correctly on OS X) to an opinion piece about my audio quality decisions. Again though, I know you were just trying to help. However now that we're on the subject...
3) I don't know if you've actually *tried* the latest Bluetooth 4.0 earbuds, but they sound *really* good. Surprisingly good. I bought these
https://www.amazon.com/Anker-SoundBu.../dp/B016Y8XJCW for $30 and I've heard a lot of wired headphones and speakers that sound worse. I certainly don't mind listening to music on them at night. (If anyone wants to try them I recommend you also get these $10 replacement ear tips
https://www.amazon.com/gp/product/B00G1WA4RA - the Anker tips don't fit as comfortably or seal as well.)
4) There's also a tradition through the decades of mixing music so it sounds good on the popular platforms of the day. (In the 60s you'd better make sure your single sounded good on an AM radio with a 2" speaker.) So even if BT headphone quality is as bad as you think it is, there's still a case for using them since that's the delivery system a lot of today's music market is using.
Again, I do appreciate the well-intentioned response. I just wish someone had an answer to my technical question.