My significant other likes to pretend the next car we buy will have TVs integrated into the headrests to keep our kids occupied on long trips. I can assure you, it will not - after all, that's an option that costs thousands of dollars, and is usually only offered on luxury cars (which we can't afford) and minivans (just no) as it is. But, as it turns out, it's not all that hard to one-up integrated TVs: you can slap on a sleek, adjustable headrest mount.
The benefits of using a mount rather than buying integrated are obvious. The first is, of course, cost - most people can't afford to buy a high-end luxury car or topped-out minivan plus the few thousand dollars it costs for the option. Even those who can will likely find outdated systems, and one that's probably not touch-driven and definitely doesn't have the flexibility of Android.