Earlier quoted context omitted.
Paper is easier to destroy quickly, and to also plausibly lose or deny having. This is actually one of the biggest problems I've found with Yubikeys: they're both too fragile yet also hard to reliably, deliberately destroy quickly.
I really don't agree. If I take a photo on my phone, it can be deleted in less than a millisecond. Shredding a paper calendar takes at least 30 seconds. I don't see denial of ownership as a legitimate strategy to data confidentiality.
* a pop up dialog confirming you want to delete the photo with the below message
> This photo will be deleted from iCloud Photo on all your devices. it will be in Recently Deleted for 30 days.
* deleting the photo a second time from recently deleted folder, with a second confirmation dialog
> this will delete the selected photo from icloud and all connected devices
bonus round: any device which has previously downloaded the photo, but is not connected to icloud services at the time of deletion, requires you to physically go to that device and connect it to icloud / manually delete the photo all over again.
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versus, take cigarette lighter out of pocket, start burning paper, wait.
[0]: statistically probably quite likely given HN demographics and iphone market share