I get a lot of emails (from various companies) that have "action required" and no action required at all. Usually "you've logged in from a new device, you don't need to do anything unless you've been hacked."
I get your point, and that's true. IMHO, I rather have some "action required" mails that won't need action than a single without the prefix that will require action.
Until everyone uses the prefix everytime...