Does this mean that older devices should still be able to play the DV content from an iPhone 12 series phone in Dolby Vision, despite not being profile 4.0?Just to clarify. 4.0 has 2.9 metadata in it as well for backwards compatibly. You can put 2.9/4.0 in Profiles 5, 7 or 8.
Also since you are clearly very knowledgeable about this stuff I will ask: What is "2.9" and "4.0" as compared to Profiles 5, 7, 8, etc? I have seem them ALL called "profiles" which gets confusing. Thank you!