Well done. The write up really being together some concepts and creates some clarity on things I've been feeling about for a while.
Is author aware of my history based fully interactive offline archiver? https://github.com/dosyago/22120
Is author aware of my history based fully interactive offline archiver? https://github.com/dosyago/22120
Haven't seen your tool in particular, thanks for the link, I'll check it out. I only used https://github.com/pirate/ArchiveBox before, but haven't set up an automatic archival pipeline (yet)!
Also, integrating with local web archives is on my Promnesia todolist! I expect them to be very useful for indirect history retrieval, e.g. "I haven't visited that page, but it's within one link". Having local web archives makes it possible to implement such functionality in efficient way.
Perhaps this page https://beepb00p.xyz/blog-graph.html would be a good start if you want to explore
Although you're right with enough work someone could engineer a way to achieve the same, even without DevTools protocol. I picked the protocol because it made it easy to achieve.
I think in future FF plans to support DevTools, or the standardised version which I think is called WebDriver protocol or something.