Aviation and space are a very, very different problem space from surface street navigation, because they rely, almost entirely, on "nothing else being there."

We've had good automation in aviation for decades. It doesn't handle anything else in the way very well at all, and while there's some traffic conflict avoidance stuff, it's a violent "Oh crap!" style response, nothing you actually want to get anywhere close to triggering. Automated approaches down to minimums require good equipment at the airport as well as on the airframe, and if there's a truck on the runway, well. Shouldn't have been there.

Same thing for landing boosters. There's nothing it really has to look at and understand that it can't easily get from some basic sensor data - speed, attitude, location, etc. It's an interesting challenge, certainly, but it's of a very different form from understanding all the weird stuff that happens in a complex, messy, uncontrolled 3D ground environment.

Self driving on a closed track is a perfectly well solved problem. Self driving in an open world is clearly very far from solved.