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Dolby disagrees with you.Atmos does not have ‘bed’ channels. It’s completely object based and the 5.1 and 7.1 mixes that are included by default are simply for backward compatibility and serve no purpose at all once there is an Atmos renderer in the playback chain.
Mixing and recording Bed and Object audio along with OAMD is how Dolby Atmos content is created.
The Dolby Atmos Renderer captures up to 128 tracks of audio. The first 10 tracks are dedicated to capture Bed audio with a width up to 7.1.2, and the remaining 118 inputs can be used for Objects and/or additional Beds. Additional Beds may be used to facilitate multiple DAW systems working on different stems (i.e., Dialog, Music, Effects), and to simplify workflows to derive channel-based stems. Increasing the number of Beds reduces the number of tracks available for Object audio. More on this later.
The OP and I are considering the differences when you don't have Atmos rendering available.
I hope in the near future to add Atmos to my HT setup, but don't have it currently which is why I've noticed the same things as the OP.