Just found this thread while Googling about Note 8. Same limitation. I came from a Sony XZP which has LDAC, aptx, aptx hd etc. I also have a Bluetooth dongle Earstudio ES100 which also supports the same codecs and is firmware upgradeable (99usd highly recommended). Just to highlight that audio codecs on the phone are software, and can be added without hardware considerations (since Bluetooth 4). However the receiving side e.g. headphones usually buy qualcomm audio chipsets, hence not upgradeable. Currently nothing supports Aptx adaptive can be bought the qualcomm products are still in the midst of adoption by audio makers.
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