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Taking a photo of a postit note instead of taking the note can be perfectly rational.
It's technologically a massive overkill too. Often the same content could be saved as a few ASCII chars needing thousands of times less storage and compute.
And the whole idea was absurd before digital photography. Why would you lug a camera, use one of 36 frames, and then go to a lab and wait 1h+ to get a print of a piece of paper on a more expensive paper, instead of taking the note in front of you!?