It's fifteen pages, but a vast majority of the content is reminding a creator what is new.
There are also revisions, name changes and format changes to track.
I'm surprised I did not see an article about this on the front page of the website (or did I miss that ?), because I completely missed this news. Thanks for the post & link.
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Perhaps this is because it might not be immediately obvious that it is a D&D 2014 to D&D 2024 conversion guide ?