The problem I found about the adaptors is that you can't charge your phone and listen to music at the same time.

I have an older car with an old stereo where the only external input is via jack. Worked perfectly fine with my old phone. When I got a new Samsung, I went through the hassle of trying several "combined usb-c charger and audio jack adaptor" only to eventually find out they can only work in on mode or the other, not both at the same time. I ended up throwing away my old phone holder and spending even more money on one with built-in wireless charging so I could both listen to a damn music and charge my phone at the same time while driving.