Comment by christophilus

An MPA can make as many queries/service requests as it needs to to render the result. Most— the vast majority of SPAs I’ve ever written, maintained, or used— do that from the client, making many requests to render the new route.

The UX for an SPA can indeed be excellent, but the average SPA is worse than the average MPA, in my opinion. It’s just much easier to break things in many subtle ways in an SPA.