And traditionally it was limited so different expectations. If you needed more you'd use PHP or something else. Problem here as other commenters have mentioned

And traditionally it was limited so different expectations. If you needed more you'd use PHP or something else. Problem here as other commenters have mentioned is how the line between SSR, SSG and others have been blurred. We're now given something that has routing i.e. NextJs but then allowed a SSG option that behaves somewhat different.