If they want to give people an undo button that always works, they could have something like a toggle for delaying all your messages by 30s, giving you the ability to undo since the message hasn't actually been sent. Toggle it on when drunk and/or angry or whatever.
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I don't deleting messages people have already read without their consent to delete it has any substantial non-malicious use case though. I would fully support features to request deletion of messages of ranges of messages on the other side, but not without their consent to do it.
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Or alternatively, sending someone an offensive picture to harass, then deleting the evidence, since they're extremely unlikely to take a screenshot of something they don't want to see vs. high likelihood of a screenshot of something they want to see and you didn't mean to send.
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Consider something like an abusive relationship where it's only much later that the victim acts upon it. They've given the abuser the ability to clean up past evidence over time, so that there's hardly any left by the time the victim actually needs the proof.
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Yeah, that's true. I think we can agree the long-term deletion capability is a bad one. I'm still not a fan of the short term one, but it's less bad,
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I can also see there's more of a valid use case for short-term deletion. It's really hard for be to understand why they would have come to the decision that long-term deletion of someone else's conversation history is a reasonable idea.