Social engineering, arguably, is one of the harder things to learn.

It's a collection of soft skills, and if you've been paying attention to rank and file tech jobs, places are looking for people with soft skills because they're so impractical to train.

This goes down to your basic help desk tech.

Anyone with an interest in computers can sit down and learn how to analyze and exploit weakness in code. In fact, it's a fun puzzle. Dealing with other people, let alone establishing oneself as another person and fucking SELLING that character enough to get what you need?

People write off social engineering far too quickly. It's quick, it's effective, and if done well, the person you exploited doesn't even realize they've been tricked.