I have (many) local albums that I haven’t fully tagged and/or added images to (ripped multichannel SACD and DVD-A). Audirvana simply cant make sense of them, while Roon can. I posted about this some time ago including some screenshots that may make this issue clearer:
Of course this may not be relevant to you at all.
On another note: I’ve just been trying JRiver (for Native DSD over DLNA). Very powerful, sure. But after using Roon it feels like… eating sand, or something equally indigestible…