Where are the metrics? Who is the target audience? What is the distribution of hardware among this target? A dramatic increase in performance on a potato might be imperceptible on the latest hardware, lessening or even eliminating the impact of your technology choices.
A dramatic increase in accessibility and end-user experience is also pretty hand-wavy. How did you come to this conclusion? Any examples? I don't see how HTML-only is tied to these things. You can accomplish or fail both with or without heavy CSS and JS.
None of the sites she links to make the case for these assertions. Am I missing something?
> Why all this backlash against HTML-only websites?
What backlash? I see the HTML-only rhetoric so often these days that it's clear this position is becoming rather fashionable.