You have been one of the main motivator for me to go for a Genelec set up and I have been learning from you from the Genelec forums
I got in touch with the VanityPro team today to find out more on the capabilities. There is now more information in the EU website
like the manual. What I learnt was that it has been tested with various Blu Ray Players and Fire stick. So I am hoping that it will work with Apple 4K TV as it sends uncompressed decoded multichannel LPCM. Apple TV can also send compressed 5.1, stereo but I am not sure if VanityPro can decode. As per the manual the VanityPro has no decoder. Singal in and Signal out.
The output options are 4 AES Out with 2 channel each.
For 5.1 or 7.1 digital surround, I see it should work as it needs only 6 or 8 channels.
For 5.1.2 Atmos, 8 channel Atmos should be sufficient but the main question is how the Dolby MAT 2.0 will be decoded in VanityPro to the 2 height channels. Here
is a good discussion from reddit.
For 5.1.4 and higher, I don't think the AES can handle.
The concept of VanityPro is excellent. It even has digital volume control. Additional HDMI inputs, few decoders like Atmos decoder, 4 more AES outputs, within a reasonable price will make this product a huge hit.