Good thing my browser settings are to show scrollbars all the time!
Interestingly 'meta' given that Andy talks about the disappearance of interactivity cues that happened about a decade back...
Windows works the same (for me at least), scrolling follows the cursor (but input does not).
Firefox reader mode works well here.
Brave's reader mode wasn't shown as an option, though my BeeLine Reader extension was able to parse the text when I invoked its Clean Mode. I was a little surprised, since the BeeLine extension didn't detect/color the text inline, like it usually does.