Earlier quoted context omitted.
Aren't we talking about a plane? And I said I trust a computer more , not that the presence of a computer is automatically enough. I'm not getting in a manually-controlled plane that's flying centimeters from a hard surface. I will get in some computer-controlled planes doing the same. (At the very least I want a real-time OS and dedicated range sensors. And the confidence of a plane owner who would lose millions of…
The plane is zero centimeters from a hard surface at the beginning and end of the flight.
The implication of the hard barrier is that it's not safe to crash into it. If there are big wheels on enormous shock absorbers making it safe to hit the barrier, then a lot less precision is needed, and you can put almost anything in control, even a heavy clamp that keeps the controls skewed slightly toward the barrier. But that's not the scenario anyone else is talking about.