Any DAW can show you that. Mine is Nuendo 13, but protools, davinci resolve, and any other professionnal DAW can do the same.
=> 1) grab a non-altered atmos mix master file from netflix
This is the fundamental error with your argument. Home Atmos formats are limited to 16 objects instead of 128 that's in the cinema, so some have to be aggregated. You can read about how they do that
here. Since home Atmos is - in this regard - lossy, this is the point where you already lost your data, this is why reencoded ADMs lose objects in your DAW. It's like saving a 5.1 as stereo, then upmixing it back to 5.1.
The reason you should not care, is the way Atmos was designed for home. It's 16 channels max, 9.1.6, that's it, the reference renderer doesn't support more, only Trinnov and Cavern, neither of which having any meaningful market reach. There are technical factors for choosing 16 (even DD+ was designed with 64 in mind), but that's another topic.
So, back to the topic, we have this 9.1.6 maximum. Why shouldn't they just pre-render that? Well, they do! Your mix is pre-made, sounds exactly the same on that layout, saves computing power, allows for transport over ARC, etc. Every lower channel count available for home users can be losslessly matrix mixed from 9.1.6, the formulas yield the exact same result after these 2 transformations compared to just mixing straight to a lower channel count.
Object movements are a gimmick and bias any discussions regarding mixing quality. There are completely channel-based Atmos mixes that are exceptionally good, like Ready Player One. The reason we have objects is clout. Dolby's bubbles are only good to show people how fancy this new thing is they "invented". It has nothing to do with the fact that channel-based Atmos existed back in 2001 called WaveFormatExtensible, I can assure you. Giving users a dumbed down studio project file conveniently makes Atmos incompatible with open standards.
I'm guilty of this too by promoting Cavern with being capable of visually rendering objects from both ADMs and EC3s. Before that, there was only that single YouTube video showing a Trinnov's renderer, and people were only blaming a few movies which were bad as a movie anyway. Giving everyone an object viewer fueled this discussion built on wrong foundations, and just made them demand more bubbles regardless they still have <16 physical speakers and nothing would make a difference.
I honestly regret making that visualizer, and especially regret making it possible to convert stuff back to ADM. It didn't exist for a reason. This bubble marketing was so good that people regularly forget that at the end of the day they listen to channels that are selected from a predetermined set. I have to tell this over and over again, and the invalid counterarguments are made with my own tools. This is just tiring. The amount of time I spent in the past year explaining these and correcting misinformation caused by, well, me, would have been enough to code support for an entire new codec.