In a lot of cars its the infotainment system. In my car there is an information system that runs in tandem with the stereo and feeds information to the dashboa

In a lot of cars its the infotainment system. In my car there is an information system that runs in tandem with the stereo and feeds information to the dashboard. Pull that out and it cannot communicate to the manufacturer. However pull that out and your stereo no longer works. There are after market stereos but nothing that fits nicely in your dashboard AND has a usable UI (there exist tesla-style giant LCD screens but the software is what you would expect from an unlicensed chinese manufacturer)