They put in the P-bit. And they just could not spend that much money again to redo it. But this short- range argument fell apart when we added a lower case alphabet. For one program there appeared a diagnostic saying that there was a jump to the middle of a DO-loop. Two different programmers can and do write completely different programs that will perform exactly the same task.
Programming is more of an art than a science.
But actually he was complimentary to suggest only two programmers writing the same program. We can probably dispose of this option quickly. It sounds good at first. Find some topnotch programmers and clone them. One of my favorite examples of great programming was done by a Chris Kilgour for the original General Electric 235 timesharing system.