I think it's a learned behavior, they were mainly talking about people fresh out of college who were evaluated based on "use the fastest algorithm for a mostly sorted set of data" type assignments. I worked with a lot of people with technical degrees who learned to think outside the box, but it seemed easier to teach technical knowledge to non-technical people than it was to teach technical people that they needed to change the rigid way of thinking that had been drilled into their head for 4 years.