[samizdatum]

In theory, the only irreducible UX distinction surrounding logically separate pages in a traditional website vs a SPA is that the SPA doesn't do the full postback, which is arguably a better UX.

Sure, in practice many SPAs might be subpar, but then the debate shifts to "are SPAs are difficult to implement correctly," rather than "SPAs for blogging engines (necessarily) creates horrendous UX". There are existence proofs of well-designed SPAs with logically separate pages and excellent UX.

As an aside, someone who pattern matches on "SPA = horrendous UX" might not even notice a well-designed SPA, further entrenching their belief that SPAs are a Bad Idea from a UX perspective!