That's just a symptom of Javascript being the entry-level language. You can be sort of productive without ever understanding how anything works.
Where these frameworks really come into their own is when you want to create reusable components and share them outside a team. jQuery did a good job with their plugins back in the day but Angular 2 (and React, and soon native Web Components) so that far better.
I hear the tale of "soon native Web Components" for years and still none in sight yet.
As far as I remember there are some attempts from Chrome and Mozilla but not sure I saw a real cross-platform spec out, so I stopped tracking the news around it really.
v1 shipped with Chrome 53, Safari 10 and Firefox 63. (And there's a polyfill.)
It's not "soon", it's very much "been in production for a while".
A base class like LitElement https://lit-element.polymer-project.org is all you need to achieve a sort of "react-like" development style (components with unidirectional data flow) WITHOUT build tools() and WITHOUT dom diffing! :)
Where these frameworks really come into their own is when you want to create reusable components and share them outside a team. jQuery did a good job with their plugins back in the day but Angular 2 (and React, and soon native Web Components) so that far better.