That's exactly what big tech executives and AI bros don't get: It would be useful to use AI for the grudgy but verifiable sub-steps of such a task, e.g. have it help with the email search, and have it suggest a reminder. Or even better, suggest creating a reminder when receiving/reading the email. But leave the user in control, and provide evidence and transparency. Instead, many companies put their bets on the long-shot, do-it-all assistent AI, but technology is just not there yet, or maybe never will even.