Exactly. Being able to copy data from the PDF instead of relying on OCR or copying by hand is a great asset.

Also, in my country if I send plain screenshots from important things like bank transfers, legal documents instead of the generated PDF file I get politely asked to send them again. If the original is on paper a good quality scan is OK though.

And, you can't certificate or password protect image files (unless you use another format as a container).