> It doesn't matter in practice if the content is still accessible when the browser tells people that accessing it is dangerous.
It certainly does matter. There's a fundamental different between people being discouraged from accessing a website, and said website being completely inaccessible.
I was referring specifically to the author's claim that deprecating HTTP and displaying a warning to users is the equivalent of "rendering large parts of the web inaccessible" and "massive book burning".
What exactly is this referring to?