>G Suite has implemented recently an option that lets you email sensitive content with a timer. The user receives the email and no content is in the email, instead a link is shown, and the content will be deleted after some kind of triggers (e.g. after X minutes, or after having been read once)

I knew that capability existed, and it sounds like a great avenue for phishing. People who routinely receive highly sensitive messages like that are going to be more apt to open a link than my mom, who is aware of phishing and whose spidey senses would be tingling.