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I think it's pretty obvious to anyone that your correspondant can read a message before you delete it. And no one assumes that deleting it from signal deletes it from people's brain.

It's not in the app, but on the support page they do indicate that deleting messages is "best effort" (ie. not guaranteed).

https://support.signal.org/hc/en-us/articles/360007320491-De...

And “best effort” may mean “no effort” for a paid subscription if the payee selects the option to retain edit revisions and deleted messages.

Isn't the whole point of disappearing/delete-able messages that you leave the meaning in your recipient's brain but not on your phones? So if a third party later tries to read your chat logs they won't see anything (sensitive).

I think it's assumed that your recipient is not malicious. I swear at some point there was a warning saying that if you enable disappearing messages it wouldn't prevent your recipient (or you) from simply taking a screenshot of the messages.