At 16m you can dive with Nitrox40 (oxygen enriched breathing air with less nitrogen) and the ground times will be mainly limited by fatigue and body heat loss.
Even on normal compressed air the non decompression limit is 60minutes or so.
Pilots are in the cockpit because their skills are supposed to be better than computers.
Whtever gives you that idea? I know the FMS will intercept and fly an ILS with 20 knots of crosswind better than I will. The reason we are there is that we are adaptable, flexible and can react to unusual situations and make rational decisions.