No, componentization is only one of the major concepts of React. Declarative reactive re-rendering is key, as opposed to having to imperatively code the details

No, componentization is only one of the major concepts of React. Declarative reactive re-rendering is key, as opposed to having to imperatively code the details of how UI parts transition from one state to the next. For example, iOS UI development had componentization, yet it was still necessary for them to launch SwiftUI this year to get on the React(ish) bandwagon.