updating a placed multipage pdf
When a multipage pdf is placed in InDesign, and an update of the pdf is needed, it is possible to do 'update link' in the links panel. But when 'show import options' is ON (in the 'place' window), all of the placed pages of the pdf will be replaced by page 1 of the updated pdf.
For my opinion, if you want to update the instances of a placed pdf, the responsive pages have to be updated. At least the option must be accessible when updating the link.