The problem is that total separation is difficult to achieve with the requirements being placed on these vehicles. Sure, whatever is playing your favourite music tracks over the speakers probably doesn't need to know anything about steering and acceleration. However, your self-driving software is going to have a tough time getting your car to a location it doesn't know exists because its onboard navigation maps predate the existence of that building, or planning a route that avoids an accident it doesn't know about because it has no real-time information about road closures.

As others have pointed out, self driving software is inherently unsafe at this moment - we don't know how to make safe network-connected software yet.

Anyway, this is moot in most cars, as they don't have sold driving software anyway.

If you read my comments elsewhere in this discussion, you'll see that I've been one of those people.

In this thread, I'm simply observing that there can't be a clear separation between control systems and information systems if we're going to achieve these kinds of autonomous functionality. We need a more nuanced solution.