What I mean is that if you use that as a pinboard you can use Pinboard.md as default page in the sidebar.
Defaulting to Pinboard could be even more confusing since the entire sidebar in Logseq is used like a pinboard.
I use Contents.md as table of contents like in other applications.
Contents.md makes sense when you want to publish your graph.
About the archived post, it was archived because refers to the old Logseq UI and one couldn’t make sense of it without that context.
Logseq devs addressed that issue by introducing Favorites in the navigation menu on the left.