Somepitch- the last sentence is the point- you have to be able to step back and regroup when you find yourself doing everything BUT flying the machine. Situational awareness is key when you are on your own. Not everyone can recognize when their SA is not were it should be, it takes good flight discipline. Cockpit distractions also need to be removed from the single pilot environment.
It is an important point, if the mission or mission equipment package is too complex to allow concentration on flying at all times, then additional crew members need to be added- always aviate first and don't allow anything to interfere with that.