Too subjective. If server cost is not a problem for the thing you call "multi-page", it is not a problem for server-side rendering either.
Vercel didn't invent server side rendering. It was always there.
Vercel didn't invent server side rendering. It was always there.
This article isn’t talking about server-side rendering, as one might have used the term 10–15 years ago (but not really before that, because it didn’t need a name before that, because client-side rendering wasn’t really a thing), but rather Server-Side Rendering, which is when you use client-side rendering tech, but run it on the server side (typically “as well”, but not quite necessarily).