Thanks Chris C. for posting this. Just for additional data points (not saying this is right or wrong, just saying what we do) - For Universal Pictures (for now), we prefer that our live action productions do, at the minimum, what you are calling out as 4, 5 and 6 in ACES. We do allow shows to use a different grading working space like AWG LogC as long as they are still using ACES EXRs as the interchange formats for VFX and pulls.
We let the production decide whether they want to do 2 and 3 - those are optional on our “ACES shows” right now. It definitely makes it easier if they do 1-3 in ACES, but we are thankful for the color scientists at our post houses who can reverse engineer the dailies looks in ACES if the show is only doing 4-6. This summer, I’m working on how we are going to incorporate AMF and CLF into our delivery requirements which we will update later this year.