My take is you won't get the discussion we have of the laws of magic and other stuff like that we have in Your Story, but that Our World makes for a very good general fan guide for the first ten books of the series by itself.
Which begs the question - how Canon is this? For instance, the blacked out part after the pyramids in Egypt definitely refer to a scene in Changes.
Does the fill and explanation in the book equate to WOJ status?
The blacked out stuff that folks can discover in the PDFs are 4th wall breaking stuff, mainly an in joke for people who figure out how to read it.