I miss this feature from FH3 and its absence in 4 makes no sense since it’s just using OneDrive as a music source. You need the Groove Music pipeline to facilitate this? Why?
Let us stream our own music, come on, there’s really no reason this can’t be done. The game would just need to read your OneDrive folder that your music resides in (and there really can’t be a whole lot more that you’d have to have if that by itself isn’t enough - something like a playlist creator to isolate the songs you want to play in-game from your entire OneDrive music library).