He makes some good points. There are good reasons and uses of the tech in SPAs, for example, I show previews of documents made with forms by hiding the form and

He makes some good points. There are good reasons and uses of the tech in SPAs, for example, I show previews of documents made with forms by hiding the form and rendering the document, but on a blog app I made where I did the much the same thing I made a button that linked to the article so users could find it easily. The "go back" button didn't work to reopen it though and I suspect search engines wouldn't have known what to do with it.