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Since this is coming up again, I'm going to again present my theory that this is Apple's fault for removing the 3.5mm headphone jack from the iPhone leaving a lot of people unable to use cheap wired earphones and unable or unwilling to buy more expensive Bluetooth earphones. @JayElHarris/1752084442250949079
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Behaviour doesn't drive technology; technology drives behaviour. Bluetooth is fiddly and drains the battery so iPhone users were incentivised to use the phone speakers by the direction Apple took the technology in.