To be fair there are some positive uses for that, but being able to delete someone else's record of a conversation within the app is also very weird and easily abused. Send someone an abusive message and delete it. Delete someone's message and claim they never sent it. And so on.
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I think you should be able to delete them up until the point that the other person has seen them. I don't think it needs a specific time limit. The other people could take a screenshot of it immediately if it was something sensitive or embarrassing. It's too late at that point.
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That's true, but I don't think deletion should be possible once there's a confirmation that it has been seen, including interaction with the app, and being able to go back deep into the history to make deletions is an extreme violation of that.
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I still don't think you should be able to delete a message that has definitely been seen, without the consent of the person receiving it. A feature for that definitely plays into the hands of abusers. A time limit doesn't really change much.
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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.