I think it's (increasingly) not as binary as either MPA or SPA. Although it has been for quite some time now. A lot of web developers strive for some amount of

I think it's (increasingly) not as binary as either MPA or SPA. Although it has been for quite some time now. A lot of web developers strive for some amount of templating and client-side interactivity on their websites. And when frameworks like React came up they solved interactivity issues but made it hard to integrate into existing server-side templating systems, which were mostly using different programming languages. So because integrating the frameworks for client-side interactivity was hard, the frameworks also took on the job of templating the entire site and suddenly SPAs were popular. I think a big draw here was that the entire tooling became JavaScript. But the drawbacks were apparent, I guess a big one was that search engines could not index these sites and of course performance, so the frameworks got SSR support. The site was still written in the framework, rendered to HTML on the server and then hydrated back to a SPA on the client. Now, even more recently we got stuff like islands, where you still use the handy web framework but can choose which parts of your site should actually be interactive (i.e. hydrated) on the client. And I believe this is the capability that has just long been missing. Some sites require no JS on the client (could even be SSGs), others require a little interactivity, and some make most sense as full blown SPAs. We're finally entering the era where the developer has that choice even though they use the same underlying framework.