[beardedscotsman]

Isn’t atmos not specifically multi channel as in traditional 5.1/ 7.1, but Atmos is positional sound that then generates the correct speaker positioning on the amplifier? For instance my home setup has support for 5.2.4 channels, two bass and 4 risen speakers. Additionally you can adapt the positioning of the rear speakers and the amp will adjust the audio to compensate.

So you could just export atmos to a 5.1 mix, but that is not a copy of atmos tracks.

[tomatocracy]

Yes - Atmos has many "objects", which are effectively individual audio streams with positioning data (which can move around dynamically). The Atmos decoder then mixes these into channels for the specific speaker configuration dynamically.