tldr; *about:you are useful, because you're here.

Browser address prefix about: is good to provide help and info to users.** (upvote for better help and info on Jolla's Sailfish devices.)

On about pages in the browser:

Failing as hrefattributes in HTML on Jolla browser, <a href="about:about">about</a>, will this change? The tech for about is underused and could significantly improve user experience, with addition of informative content, and little or no added code.

If this is untrue, please detail the ways so future work is clear and actionable.

Imagine about pages with embedded videos, audio, or text-to-speech configuration and implementation.

Workflows would be an collection of URLs with tags, which users could edit like grouped bookmarks with manipulation semblant of pushd, popd and dirs, but for net and program links and their descriptions (not only directories). This may make browser context have more relevance in different activities' phases. The same could be done with page navigation session logs, so that activity histories would not only be merged into one list.
TODO Set up useful working example(s). Test a terminal-based version to define steps and allow alternative or fallback capability.
NOTE If code additions are required, consider using the form about:this#named_content to hook into local (downloaded) info pages.