Why should we learn front-end frameworks?

I am new to React and, frankly, started learning the framework due to great bandwagon on the use of this framework. But later asked myself Why on earth should we learn front-end frameworks? Why were front-end frameworks created and what problems do they help us to solve. After some research, I found out that, for example, React with its virtual dom helps to achieve efficiency when we change dom. Also, React helps to achieve easier maintenance and reusability thanks to components. Am I correct with these statements?, that is, if we do not use front-end frameworks, then dom updates will be costly and slow and ui will be harder to maintain and reuse since we do not use components. Is that true?