GUIs lend themselves well to component-based (a.k.a. Object-Oriented Programming-based) approaches. The earliest GUIs used OO techniques. And JavaScript has VER

GUIs lend themselves well to component-based (a.k.a. Object-Oriented Programming-based) approaches. The earliest GUIs used OO techniques. And JavaScript has VERY weak OO functionality. Or rather, the browser has very weak OO functionality. Everything is global. Any piece of code can just modify elements in the DOM as they wish. There's no modularity or namespacing. When building a big, complex, interactive GUI, it's a lot of work trying to use a homegrown approach. Better to just use what has risen to the top - React,etc.