Wow, this is a really nice writeup :)
The page seems to have hijacked scrolling, or otherwise broken it really badly. My up/down keys seem to highlight different paragraphs of text, whilst the usual scroll commands don’t seem to do anything, nor do PageUp/Down.
In fact, it seems to have taken over all key presses, breaking my keyboard shortcuts (I found this out when I gave up trying to read it, and found that my close-page shortcut stopped working too)
Yeah, that is what notion.so does, I also find it quite annoying. On the other hand, it is really superior platform for writing blogs.