Can't speak for everyone but here are the reasons I prefer an actual jack:
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3.5mm headphones are extremely universal and can be used for any audio device. USB-C and Bluetooth headphones cannot
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Bluetooth is extremely inconsistent when paired with multiple devices and often gets disconnected because of competing devices
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I can't charge my phone and listen to USB c headphones at the same time
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Manufacturers claim the removal of the jack was to improve the water resistance. I have never dropped my phone in water and would be willing to risk it.
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I already have too many wireless things to charge
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I have a small stockpile of broken wireless headphones. Meanwhile my 10 year old wired headphones are collecting dust
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I have never lost something more often than that tiny ass USB to 3.5mm dongle adapter
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I distrust large corporations with incentive to get consumers to buy more stuff from them
I'm willing to bet that not one single wealthy person benefiting from these tax cuts thought: "Hey cool I'll pass the money I saved from these tax cuts down to the less fortunate"