I was disappointed that the article didn't describe some of the motivating forces behind the basics. I think such concreteness would make more sense for a high school student. As an example, the development of geometry was (at least partly) motivated by the need to restore property lines after the annual flooding of the Nile in Egypt. I have no idea if it is part of an "origin" story for probability but wanting to win at dice games is one motivation for understanding probability. One of my heroes, Grant Sanderson, the creator of 3Blue1Brown is very clear on how the concrete needs to precede the abstract in many of these studies, and y = mx + b is pretty abstract if all you've got is those six symbols.
