Bluetooth isn’t a wire, there is a lot of lag in the compression, sending (and resending dropouts), decomposition, device processing and finaly pumping it out.
If the two devices aren’t in exactly the same time it will sound shit. So until recently no one has spent the time to enable such a feature.
Manufacturers are starting to add meshing between their own brands, Bluetooth 5 is adding some delay info to potentially allow this between brands.
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