The people making the videos are much more aware of who their audience is and how to communicate to them. They make the assumption their audience is intelligent

The people making the videos are much more aware of who their audience is and how to communicate to them. They make the assumption their audience is intelligent, but unfamiliar with the subject material. So they avoid industry terms and jargon, and instead work on establishing understanding of basic principles in familiar terms then elaborate on them gradually. I've seen similar approaches in teaching people with no technical background how to write code, to great effect. It's by no means easy to write such curricula though. What you're doing is taking a very complicated topic with expert-level information and translating it to non-expert language and ideas. It requires a sophisticated understanding of the topic, and good communication skills. By "good communication skills" I don't just mean being good at talking or writing, I mean the ability to empathize with and understand your audience's point of view, to anticipate their confusion as well as their understanding, and to handle both gracefully. It is important when writing these kind of explainers to not come off as condescending, and that can be especially hard to do when simplifying a complex topic. I also love these videos, because they're a master class in how to communicate effectively.