Not GP, but I think the websites would be largely similar to the end user (multiple pages with dynamic bits). However, I think there is a notable architectural

Not GP, but I think the websites would be largely similar to the end user (multiple pages with dynamic bits). However, I think there is a notable architectural difference. Modern JS frameworks are much more focused on providing reusable components with clear methods of interop and communication. I think the codebase of a "multiple small SPAs" would be easier to reason about and develop than a jQuery tangle. But in terms of functionality, its probably not much different than sites from 10 years ago (I don't think this is a bad thing).