One important and more subtle advantage of SPAs is that they enforce a clean architectural separation of concerns between the untrusted view layer and the backe

One important and more subtle advantage of SPAs is that they enforce a clean architectural separation of concerns between the untrusted view layer and the backend API. This decoupling allows the frontend team to iterate quickly on user experience and run experiments without affecting the underlying business logic. This also makes it easier to build alternative interfaces (e.g. mobile apps) that share the same API. Of course these benefits matter only when building more complex applications (not simple content sites).