I was wondering how Apple got zero latency for the UI sounds on the ATV. Where did you see that tidbit about 20% of the bandwidth?I mean there's a reason why wireless desktop speakers aren't a thing. The latency is unacceptable for anything you need sound to be not behind, like UI sounds or gaming. Video where you can avoid the delay by syncing to the latency and music are basically fine - but for anything else this is an extremely hard problem to solve. They haven't even solved this on the Apple TV yet with their hacky dedicating 20% of the bandwidth on top of AP2 to try and have the HomePods keep up with the UI sounds - and they still crackle.
It's an almost impossible problem to solve.