Off topic complaining about the website: What’s up with scrolling on that site? I’m on iOS safari, and when I click through to one of the pages (say Mastsdon)

Off topic complaining about the website: What’s up with scrolling on that site? I’m on iOS safari, and when I click through to one of the pages (say Mastsdon) and do a quick “throw scroll” (you know, when you move your thumb quickly across the page and lift up and the page keeps scrolling by inertia), the page stops immediately after my thumb leaves. (See any HN page for a working counter example.) Why does this happen? Why is someone overriding scroll events? Why not just leave stuff alone and allow a consistent experience? Why? Why? Why?