Can someone tell me the advantages of all of these extra extensions for Flask? I thought the point of Flask was to make the framework part extremely light-weigh

Can someone tell me the advantages of all of these extra extensions for Flask? I thought the point of Flask was to make the framework part extremely light-weight. When I need a REST-ful API for a Flask app, I just build the routes needed and code it up myself. Why both adding a whole extra framework for something? Flask by itself is already capable of supporting REST-style requests, so what does this do again? How much of the example listed was ordinary Flask-webapp code and how much was this extension? Add an HTML view to a JSON object and form for making REST requests? Between this and the User extension from last night, I must be missing something. Or maybe I'm just old.