The pushState API has been available for years. This isn't an inherent limitation of single page apps. Even where the pushState API isn't available (older versions of IE) the anchor tag can be be used to maintain browser history so the back button doesn't break. https://developer.mozilla.org/en-US/docs/Web/Guide/API/DOM/M...
But here's the deal: now the web developer has to manually do something that used to be intrinsic to the way the web worked. Really feels like a step backwards to me.
