The ratio is off. You learn a lot more from high school and bachelor’s degree and you learn way less with your master. PhD is just expanding a little bit more on master.
The visual is more about highlighting specialization and its distance from the limit of human knowledge. You often can’t represent every aspect of a complex subject at the same time on a single visual. Kinda like how you can’t represent the solar system distances and planet sizes to scale on a single page, you have to pick one.
Common knowledge would be more appropriate. It is known by many people, but it is not basic as in obvious. It took a long time to know what we learn in a very “basic” high school biology course.
And if you actually remember half of what you learned in that course a decade later, people ask things like, “where do you learn this shit?”
