There are people who memorize only what is required to pass a test and once they do so, they think they have learnt the subject matter. So you end up with some

There are people who memorize only what is required to pass a test and once they do so, they think they have learnt the subject matter. So you end up with someone who "knows" Big O because they memorized the current algorithm and and what works best in each situation but if you present them with a new algorithm, they will not be able to tell you if it is better or not because they can't do the analysis. There are alot of people who just want what is required to do their job now, are not interested in how the tools they use work and resent it if you change the tool or make it work differently.