I'm not sure "driving an older car" is a very niche case. 3.5mm jacks on car stereos go back literal decades, and my 2019 Jetta still has one (even though it also has Android Auto + CarPlay). Even as far back as cars with cassette players saw people buying cassette tape adapters so people could route 3.5mm audio through the tape deck.

Even in newer cars, it's the same kind of choice reduction you see on phones, though. With a jack you can choose whether you want wired or wireless audio; without a jack you're still with wireless all the time, even when wired would be more convenient.

It's definitely a niche, most people buying $1000 phones are probably driving newer cars.

However I think use cases like air travel or just hanging out at home with a low battery are less rare. These can be partially mitigated w/ wireless charging, but when I use a wireless battery pack on a flight my phone and tablet don't do a great job actually staying in place, and necessities lowering the tray which is annoying