Notice the “merge” comment at the beginning of that commit message - that means he’s just incorporating stuff that other people wrote.
Also, I don’t think it’s actually sensible to alternate between fun books and skill books like that… for one, the focus gain you’ll get from one round of reading a fun book is going to be quickly offset by the focus loss from studying a skill book. And second, having low focus doesn’t penalize skill gain from books. Perhaps it should, but for that to be at all playable, we’d have to un-nerf skill books first.
Actually, maybe the help text should be more clear that focus does not currently affect skill book comprehension…