Github is actually a great example - i think it's getting better gradually, but for a lot time it was really obvious that it was server-rendered pages with a fe

Github is actually a great example - i think it's getting better gradually, but for a lot time it was really obvious that it was server-rendered pages with a few ajax calls sprinkled in to do small things like update the status when the tests finish. And it led to all kinds of weird edge cases and unpredictability, some things would live update, other things you need to do hard refresh to see the latest version, sometimes when using the back button it would reload the original version of the page before the ajax calls had succeeded so you'd see old data. Clearly it wasn't bad enough to drive everyone off the platform, but there's no way you'll convince me that that was a better system that a well-written SPA built with modern tools.