Regarding your last sentence, I think technical jobs, and especially people who write code as part of their job, are forced to develop a special kind of humility. Engineers, scientists, technicians, deal with the law of physics everyday. As a developer particularly you get immediate feedback dozens if not hundred of times a day. You can't bullshit your way out of a bug. The computer is cold, rational and executes the piece of code you wrote. You can't convince it to run your program with pretty words.

This is in contrast to other jobs, for example marketing specialist. As a marketing specialist you spend weeks or months on a well crafted marketing campaign, then you launch and the results are not bad but yet not great either. There could be millions of reasons for your campaign to have failed. You could job-hop thinking you did a great job and blame the lukewarm success on external factors.

There are people who spends their whole career failing at what they do who would never know otherwise because their job lacks this sort of cold instant feedback.