In my experience, there's strong correlation between programmers that don't know how to implement basic data structures and programmers that make poor decisions

In my experience, there's strong correlation between programmers that don't know how to implement basic data structures and programmers that make poor decisions when picking up one from a collections library. The ones that know that they don't know at least stick to fixed sized arrays and pay the performance price. So, no... and yes. You can call yourself a software engineer without knowing any of this stuff, but you will be a better one if you do.