Not the OP nor the post's author. We have a similar stack (React + NextJS + TypeScript + Mobx) but use a traditional REST API using Django Rest Framework. There are some interesting topics in the post and in these comments that I figured I could expand on:

1. The primary reason we chose NextJS (with SSR) was to be able to write a declarative React component that is run on the server and the client. For example a button to follow or unfollow a page (think: like/unlike in social media). In the previous generation of our application, we wrote the button in PHP that rendered HTML and toggled UI state on the front end using JS/jQuery. That meant writing the button logic (and HTML/CSS) in two places instead of one. Now, we have a single React component that renders itself based on state; it's the same component on the server and client.

2. I don't understand the extra work to avoid SSR. SSR is great and can be used behind authentication--there's no actual need to work around it. Additionally, in a NextJS application, SSR is only used on the first page load. When you click from page to page, it's all client-side transitions.

3. @yashap said "The FE stack at my current co. is React, MobX and TypeScript, powered by REST APIs that are well documented via OAS. It’s a very nice, easy to learn and maintain stack." Agreed. Same here. It's wonderful. In particular Mobx. A lot of the comments seem to say "I expected the article to talk about how to maintain state in a React application"--that's how. Use Mobx. No matter what reactive JS framework you're using, use Mobx to maintain "global" state.

4. The discussion of "why move to NextJS when my Webpack config from 6 years ago works just fine" is a good one. Two big reasons we moved to NextJS (away from a Webpack config from 7 years ago) were: the handoff from server -> client is more seamless and the developer experience with hot module reload for server + client sides was worth it. Any JS application these days is going to be a tooling nightmare: Webpack, Babel, TypeScript, ESlint, React, polyfills, plugins, and then dependencies. That's awful no matter what JS framework you choose. Create React App doesn't fix that, it just hides it for the first step of creating a react application. You still have to maintain all that nonsense.