I'm very sorry about that, we're testing this system as it's a brand new UI; we had left it closed not to overwhelm people, but we can leave it open by default if needed.
Heya, while you're taking feedback, the link in "If you haven’t read OS/2’s side yet, you can do so by either scrolling the page up (on bigger screens), or clicking here." doesn't do anything for me when clicked. It's also not immediately obvious that the OS/2 article is in the upper-right and needs to be clicked again. Why not link to that article straightaway? :)
I'll fix it immediately, thank you!
Why should text need a custom UI that is so noticeable that it has failures?
Edit: oh, I see. The whole thing is stained glass.
I had the same confusion and closed the tab, only to discover here on HN that there's more. Open by default sounds reasonable.