you are totally correct!
tbh i think there's quite some misunderstanding about 360RA and what it does and how it does it, understandable because i don't think it's been properly explained in plain English by Sony themselves!
as we know, there are a number of CBS Quads in 360RA on Tidal & Amazon Music Unlimited that have not been released on Apple Music in Dolby Audio or elsewhere, including many of the biggies such as all 3 Aerosmith's, Simon & Garfunkel, 2 of the 3 Paul Simon's, all 3 Dave Mason's, Janis Joplin, a number of Santana Quads (incl Festival & Borboletta) etc., etc. hopefully some or all of these might make it to Apple Music in the near future