There’s something to be said for making a sleek, static HTML site, that’s unlikely to go away. However, in practice, JS frameworks are everywhere nowadays. Given the number of SEOs who have a good grasp on technical SEO for static HTML, if you want to differentiate yourself, understanding how JS works, where it works with SEO, where it blocks SEO, what the effects are on other search engines & clients — obviously on top of understanding technical SEO — will make your services much more valuable. Coding isn’t something everyone likes to do, and there’s enough around SEO which doesn’t involve doing that, but if you’re keen on JS, there’s a big opportunity here.
I do not disagree, I doubt many SEOs disagree? But if you do, I am sure I will hear from you in the comments.
Forum discussion at Reddit.