You might ship 2MB of JS to each user once, but you then avoid shipping markup-heavy HTML on every click (like you do with SSR). But the point is somewhat moot

You might ship 2MB of JS to each user once, but you then avoid shipping markup-heavy HTML on every click (like you do with SSR). But the point is somewhat moot as modern Internet connections and devices won’t struggle with a 2MB payload in any case.