It's not killed IMHO, I actively use a fleet of such single HTML file apps that I save locally and even share with people. My initial comment has an example of a gallery, works wonderfully.
The web "browser" wasn't "intended" for this use case, hence the issue. This could be easily fixed though -- just like cookies.
I explicitly do not want such a thing in many of my HTML-apps, but one could add it with relative ease.