Where do you see proof that svelte can’t handle something like Facebook. That is just assumptions. Facebook was built without a virtual dom long before it had one.
Also, once again most websites are not the size of Facebook. So it’s about your needs.
I would also argue it’s about how the developers work offline, the component architecture, that makes these frameworks valuable. Not the user experience. Nothing a SPA, svelte or react, does is something a standard site can’t do from a users point of view.
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