The graphic is misleading:

- You can easily do prerendering and asset packing in the frontend build step

- You don't need MVC on the backend

- You can use a third party for authorization

- Frontend can just be a React app

- VirtualDOM doesn't add any complexity in addition to the frontend View

- You don't need MVC on the frontend

- Frontend can fetch data from the API and cache it with cache-control header

The simplest setup is actually to host a React app from an S3 bucket and use Lambda / Cloud Functions to respond to network requests.