You will still have a large app--instead of having MVC in the browser you will likely have MVC in the server. And MVC in the browser doesn't need to be complex

You will still have a large app--instead of having MVC in the browser you will likely have MVC in the server. And MVC in the browser doesn't need to be complex. It can be tiny as seen in this MVC lib for React: https://github.com/rajeev-k/mvc-router https://github.com/rajeev-k/mvc-router