It sounds like we have very similar mindsets. I personally make it a point to not use jquery because I want to be able to code whatever it does just as quickly with modern vanilla JS. But I'm also very intentionally pursuing being really, really good at JS. But that is very specific to what I do and suites my career as a "UI" developer well at the moment. Sounds like you are much more well rounded in your skill set than I am so makes sense to not invest extra time in learning bare bones es6 as a focus.
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