I have found that it is pretty difficult to find what I'm looking for when searching for articles/issues that relate in any way to the Next router. "App router" and "pages router" were two of the most ungooglable and generic name they could have chosen. Suddenly it is much more difficult to find what I'm looking for in the ecosystem.
Sorry about this. I work on the documentation (author of the post). Are you talking about searching through the docs or searching through GitHub? ARe there specific things you've searched for you couldn't find?
I'd also like to mention that I regret my uncharitable phrasing in my original comment "…the most ungooglable and generic name they could have chosen…". While I do think more specific names might have helped in some ways, I can appreciate the difficulty in coming up with names for this kind of thing.