Because it will not work with the rest of your gear.
I realized how silly it would've been to be unable to participate in those moments.
You were presented with a usecase where a wire provides a convienence that Bluetooth can't match. How can you just ignore that and say wires don't make sense?
Even aux ports aren't that common in cars, certainly less common than bluetooth in recent cars - a 3.5mm -> FM Transmitter adapter seems like it would be more universal.