> To successfully use an abstraction, you need to understand the problem the abstraction is trying to solve and also understand how the abstraction has solved the problem.

Not just abstractions, but just about everything we use. For example, why were arrow functions added to JavaScript? After all, everything you can do with arrow functions you could do previously without arrow functions. What was the problem that arrow functions were trying to solve and how do arrow functions solve that problem? I wish MDN was updated so that at the top of every page it first gave an overview of what problem this particular feature solves and how it solves it. Including how the problem used to be solved with "old" syntax and why this new syntax is preferable. And when it is not preferable.