The count of pages in a PDF can help us understand whether there are primarily short PDFs (perhaps most easily converted to HTML) or very long PDFs (perhaps for specialist audiences).
General Usefulness:
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Ease of Automation: ⚙⚙⚙
In Content Chimera
Content Chimera can directly count pages in PDFs, so you have a field for each PDF that contains the count of pages for that PDF. This can then be charted, filtered, and used in rules however you wish.