I see Next.js primarily focusing on server-rendered React and then it also supports client-rendering. I see create-react-app is primarily focused on client-javascript. Am I missing something?
Next.js also focuses on client side JavaScript, but happens to render at the server first, so that there's something there for users before the client bundles have downloaded, parsed and been executed.
You could think of it as a more configurable create-react-app that supports server side rendering, with a convention over configuration approach to pages and links.
You are a poet, sir. Best answer.