Reddit, Twitter, Instagram, Nike, Adidas...

As far as I'm concerned you want to use a SPA when you have dynamic interlinked state. None of these sites have that. You give up so much simplicity going to SPA its kinda crazy and again I say that as a person who loves Svelte but I think is only necessary for occasional core pages.

But I constantly doubt myself, I must be missing something? Maybe its just easier for large orgs with dedicated frontend/backend devs but it really doesn't seem efficient.