It's weird for this analysis to focus on the total size of the app. If a Svelte app has 100 components but a page only uses 10, then surely it's possible to only fetch these 10 components and defer the rest, right? This way the size of each page does not have to grow linearly with the size of the app. And the size of each page matters more than the total size of the app -- after all, we're on the web, not on mobile where users need to download the whole app before running it. Am I missing something here?

Considering the cut off point being very close to 10 (small components) - it all comes down to that Svelte, in practice, doesn't have any (significant) advantage bundle size wise.

rrally depends on your setup. When I used Vue Router it prefetched all the route components (so frst page load isn't affected but total bandwith is for the whole app), or if the app is a PWA, the whole app is downloaded in the background.