Unfortunately in web programming, an inordinate amount of time is spent on concentrating on the rendering side, messing around with the CSS/CSS framework, because thats what people see, and less on understanding state flow or the backend data model. That on top of deadlines, and have a recipe for disaster. It actually took me, a seasoned programmer with 15+ years professional experience, a few weeks to understand React one-way data binding to the degree that my UI did not have severe bugs.

But when you do have a nice component hierarchy, reasonable CSS and proper data flow mechanisms, its quite nice what it can accomplish, that would not almost unfathomable with Vanilla JS.