I mostly agree, however there are exceptions that prove the rule. Some engineers are working on standard libraries. (someone has to write that code!) Some people are taking advantage of their data set to write special-purpose sorting algorithms that blow generic algorithms out of the water. (guilty!) Some people are putting stuff together in interesting ways that requires them to understand and sometimes even re-implement the standard algorithms to take advantage of internal data structures or other interesting effects. (It's bad practice, but knowing the order a map will iterate things in can be helpful if you don't expect it to change -- and make sure to have a unit test that proves it!)
