The value of knowledge is extremely subjective, especially in the software field. When spending time on the development of technical competence the question is always whether to go broad or deep. The answer depends on what you have to do and what you plan to do. If you are a JavaScript specialist and you spend 80% or more of your time working with JavaScript, it's probably good to know the obscure parts. If you do work on a framework like react or angular, then knowledge of the languages nuances and quirks is essential. But if you primary work in another language and only use JavaScript for front end work, or you are an entrepreneur and you also must do your marketing, customer support and product development then knowing this sort of information is only a distraction from your goals. Think about where you want to be vs where you are and it will be much easier to decide the value of that knowledge.
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The value of knowledge is extremely subjective, especially in the software field. When spending time on the development of technical competence the question is always whether to go broad or deep. The answer depends on what you have to do and what you plan to do. If you are a JavaScript specialist and you spend 80% or more of your time working with JavaScript, it's probably good to know the obscure parts. If you do work on a framework like react or angular, then knowledge of the languages nuances and quirks is essential. But if you primary work in another language and only use JavaScript for front end work, or you are an entrepreneur and you also must do your marketing, customer support and product development then knowing this sort of information is only a distraction from your goals. Think about where you want to be vs where you are and it will be much easier to decide the value of that knowledge.