Say that your opinion is correct, and every web developer agrees with it. What could web developers do about it? The gaps you are talking about in vanilla JS does exist, so until they're plugged, web devs would still prefer to use these frameworks until the standard bodies and browser vendors make a better alternative.
To understand how to improve JS, try writing in vanilla JS (no frameworks) and find the common pain points. Organise with fellow JS developers to get features to address these shortcomings in the EcmaScript standard. Once this is done, use tools like Babel to polyfill the missing functionality from the EcmaScript standards until browser vendors implement them. Rinse, repeat.
Web Components might be the solution, but it's not exactly ready yet: https://caniuse.com/#search=components