create-react-app doesn't support server side rendering. There are apps that don't need that- but I believe SSR should be the default, not the edge case.

create-react-app is a bundle of configuration. Configuration you'll likely need to override eventually. You're advising people new to the ecosystem blindly trust opaque configuration, and not bother understanding the underlying tools? This is terrible advice. (And if your argument is that you shouldn't use a tool without knowing how it works... Why use CRA at all? Write your own config.)