Component and controller-views do not serve the same purpose. Views are just to declare the UI controls, controllers typically react to view events and user interactions on the screen and act as an interface between the model and view.
Components on the other hand are independent and reusable entities that encapsulate all the UI assets within an application. Components allow the application to be used in more flexible environments like on a Fiori Launchpad, unlike the static index.html page.
Refer SAPUI5 Components
Bluesky
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