Why not contributing the guides on ifixit and just keeping local copies? You can at least save a pdf copy?

How often will your internet go out? You could also cosnider an archiving solution for visited pages. Archivebox comes to mind.

Take a look at pocketbook devices. https://en.m.wikipedia.org/wiki/PocketBook_International

What’s the main difference or improvement compared to logseq?

This. After the initial learning for i3wm I never looked back.

And I dread the times where I have to use something else (work environment…)