I think people just focus on problems entirely within their own domain and rarely branch out to anything else. The amount of times I've had to explain to senior

I think people just focus on problems entirely within their own domain and rarely branch out to anything else. The amount of times I've had to explain to senior devs of 20+ years how DNS works at a very simple level would astound you, which is something that I would assume should be picked up if not by learning, through sheer osmosis, but you'd be surprised. If you lack a formal education, and maybe went through a bootcamp - which there's nothing wrong with - you may not know a lot of things that would surprise this author.