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Please read my full comment. First, AAC is not even used for duplex audio such as in telephony. For that, the Bluetooth standard downgrades to SBC mono 16khz at best. Additionally, AAC is high-latency, even it is used. So it is not "perfectly fine" at all.

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AAC is perfectly fine for listening to music transparently, and watching video.

And no one cares enough about the duplex audio stuff for it to matter. Phone and Zoom calls sound decent enough with pretty much all bluetooth devices now. If you care about that you'll be using a real microphone anyway and can have the headphones not in duplex mode.

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