I can’t tell which side of the argument your response is supposed to fall on…
Yes, people typically listen through their car speakers. Good job. Gold star.
But not all cars have Bluetooth connectivity. There’s still a lot of people who drive vehicles that have to rely on 3.5mm connections (either directly, or with cassette or even CD adapters!). Or maybe their car supports Bluetooth audio, but they prefer the higher fidelity audio that a 3.5mm interface provides vs Bluetooth.
Maybe I’m missing something here. But this response holds no water.
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