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The alternative is a "Full Code" solution using React. This involves a lot of coding and it's not always easy to update content without doing a release. There's the option of using a Headless CMS for the content and but that only increases the amount code required.
The Brill Framework provides the best of both worlds. Quick building of the application using a CMS and a set of ready made components, with the ability to add your own React components and server side functionality.