Why do you not required to use inheritance?

In React, it is recommend using composition instead of inheritance to reuse code between components. Both Props and composition give you all the flexibility you need to customize a component’s look and behavior in an explicit and safe way. Whereas, If you want to reuse non-UI functionality between components, it is suggested to extracting it into a separate JavaScript module. Later components import it and use that function, object, or a class, without extending it.