I'd love to get other peoples' thoughts on this, but I think we're at a tipping point back to vanilla html/css/js.

There used to be a huge need to jquery, bootstrap, polyfills, and other tricks, but many of those features are now available in the built-in languages. If you ignore IE, then you can make elaborate websites just by writing it by hand, doing some plain css grid, svg, html5, etc. How much time is spent resolving npm dependencies and packaging scripts for simple libraries that used to just be adding a .js file to your repo?

Obviously, web applications (that do more than show some content) will need more infrastructure, but I feel like we can safely stick with mostly vanilla languages for web pages that is content-focused. Let's go back to the days where you could learn a lot from View Source, and version control was dead simple.