
That’s certainly an issue, but for me it was already quite useful for deleting unread obsolete messages (e.g. deleting “can you bring milk” after you realized that there still is some), or messages accidentally sent to the wrong person. I think limiting to a short time frame and/or only unread messages would solve most of the possible abuse.
I have the outlook lite app on my phone. It simultaneously prompts me to move my other accounts over there, and to uninstall it because it’s becoming deprecated soon.