I'm not claiming that there is no use for Jack. I just think that this is a niche and doesn't require a separate connector in every smartphone. Having a universal connector that can be used for various niche scenarios is IMO enough. We should push for improvements in that regard (e.g. make it easy to charge the phone and use the dongle at the same time).

I wish I had the same problem as you do with your car. Mine is old enough that it doesn't have Bluetooth (I'm not the first owner and Bluetooth was an "extra" in this model) but new enough that there is no cassette player (and no built-in aux input) :)