There is a whole class of web applications where it does not even make sense for search engines to index your site: todo lists, real-time chat, finance, and so

There is a whole class of web applications where it does not even make sense for search engines to index your site: todo lists, real-time chat, finance, and so on. So yeah, if you think it is important for your app to export content, then by all means don't build a single-page app.