[apotheon]

Those points can be trivially met with static HTML and something like IPFS, and you can still download HTML for local storage and viewing. You can even print to PDF if you really want to do so. Meanwhile, PDFs also allow dynamic files, don't require dating and hashing, and can be used to spy on users or deliver malware.

EDIT: Oh, yeah, and static file formats doesn't necessarily have to mean static document formatting when viewing -- unless you're using PDFs, which tends to break useful stuff like reflowing for paginated documents (one of the worst things about even simple PDFs).