[paulluuk]

> The only realistically important optimization is bring you big O down. That and understanding when big O doesn't matter for your problem size.

Of course, understanding big O is still very important and being able to apply it to real-world problems instead of just online code puzzles is even more important.

But I think it's importance is a bit exaggerated in the coding community, when there are arguably much more important skills for engineers such as building good relationships with your colleagues, knowing when to cut corners to get work done on a deadline, and knowing how to negotiate salary and promotions.