I love the idea of a SPA without full page refresh. But from experience, the UX of that is terrible! 99% of SPAs i've tried prevented me from using history navigation from my browser, and simply failed in unobvious way when the network wasn't reachable (yeah just keep on spinning without ever loading anything or timing out).

When doing a "full page refresh" my browser has good UX for displaying errors and retrying requests, potentially resending <form> data. SPAs don't have any of that.SPAs is a cool pattern but as long as it is not supported by the HTML/CSS specs (and therefore the browser natively) it will remain terrible from a UX perspective.