Comment by 3np

The more something behaves like an actual application and the higher the number of user interactions per visit, the more sense the SPA approach makes IMO. This is because the initial load overhead of an SPA gets amortized over subsequent interactions.

Blog or corporate/news website on one end and an interactive game or video editor in the other, with a site like FB somewhere in the middle.

It’s not a hard rule and I can already think of counter-examples but this line of thinking is useful when architecting a new project.