People with CS degree and decades of real world experience still benefit from automated code analyses. We deal with systems with millions of lines of code...

Exactly, this is pretty clearly aimed at beginner/intermediate programmers who haven't entirely figured out how to decide when to use List versus Set versus Map. It's probably obvious to the typical HN reader, but valuable for the target audience. Might not belong here, although the fact that it's currently at #3 on the front page suggests there's enough interest in it.