Not even sure what you're trying to argue at this point. Apple has passive stereo reproduction in their entire product line. HomePod is a different form of technology that neither Apple nor Sonos has ever offered. The question you should be asking is how long it will take Sonos to have something beyond a passive system.
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Sonos: sound is in sync, nothing else happening.
Homepod: sound is in sync, system actively monitors sound waves/reflections and makes adjustments.
Ha. You’re asking me what I’m trying to argue?! That’s rich.
Two Sonos speakers CAN play stereo. Two HomePods CANNOT - because that feature is delayed.
How either system does it, and which solution is better, isn’t the issue and never was. But you persist in steering the topic to how Apple does it. Not a single one of us (unless you work for Apple and have actually used HomePods to play stereo audio) is qualified to judge which solution is better.
The two features that Apple has delayed, multiroom audio and the ability to pair two speakers and output stereo sound, have been available with Sonos for many years.
Is that clear enough for you?