to the point of view of PAX, its a valid question, i mean if you didn't *need* two people, why are there two people in the pointy end ..
and i am sure it would have been similer when flight crew were 3 or 4 persons..
Members-of-public don't know the details of the job, nor should they have to,
but in that situation i would have to be going though their collective minds, that planes do crash occasionaly, despite or best efforts