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For a known piece of music some if these problems go away, don't they?

Regarding sync response time I don't think that's so much of an issue because after you recognize the song you know what the future waveform will look like in advance.

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You know roughly what the future looks like, but it only takes a tiny (sub-millisecond) amount of error (due to user movement, clock drift, wireless lag etc etc) to throw the phasing off and ruin the effect. So you still need some combination of precise modeling/listener positional data and/or a sophisticated algorithm that uses an input signal to detect and correct the error and keep you “out of phase”

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