I do all of John’s rules except Genre , but i use a a std 01 - Orchestral, 02 - Concertos etc then I add a Sub Genre say 05 - Keyboard - Piano Sonata , this is a throwback to my JRiver library . I t does nothing in Roon as I accept Roon Genres as is
Its a bit “Gramophonish” order
Navigation in Roon is probably more important , I tend to go Artist> Discography>album these days