Vanilla JS is important, But, Why, Do I have my own hypothesis? It was literally a Hypothesis. And, there are numerous type of learning JavaScript....
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Why javascript at all though ?
If your area of interest is Mathematics, javascript doesn't sound like a good fit. You're probbly better off learning R, Python, or even a fuctional language like Haskell.
Because I was interested in visualizing the web browser, my background is based on visual design, It was connected to front-end engineering, But, Now, I am more opened to learn any type of language.
Yes, I respect your opinion, I consider having the wisdom to use the knowledge productively, Programming is taking an action based on the CS knowledge, in my opinion. I wonder what kind of knowledge you consider learning to code, as well.