You are claiming that binaural output is the sole throughput for ATMOS
Not at all. This wouldn't make sense otherwise the binaural mix of same Atmos album would be playing on my Denon AVR.
Ask your studio sources how a WiiM Mini streamer can know whether the user has their streamer in a speaker or headphones setup ?
As I already wrote and repeat again:
An iPad playing Atmos only play's binaural mix. If you connect iPad to USB DAC with speakers it is still binaural mix. Which is wrong.
An Apple TV is always used with speakers.
You are expecting WiiM to solve something nobody has yet, not even Apple.
I don't think your sources are understanding the practical issue - they only thinking theoretical
If WiiM lets the user select headphones or speakers, then it may select correct Atmos. But as I already wrote, until then, better to disable Atmos.
You do not want binaural mix playing on your 2 channel speakers
Anyway im having to repeat everything so I'll stop and exit this thread