Club MacMost Exclusive: New Record Audio Feature In Pages/Numbers/Keynote

This feature puzzles me. I can see using it in Keynote to provide narration on specific slides. The only use in Numbers I can see is maybe explaining how a sheet works to someone who didn't create the spreadsheet. For Pages, I can't see the use. You can't export it in the PDF, so maybe just for annotations?But maybe I'm just not the target audience for this feature. What would you use this for?

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