Once I click the link, it takes me away from my email inbox. That means I have to go back and clean them up later. That's extra work for something that should be ephemeral. No thanks.

I can't quite put my finger on why it's different from having SMS 2FA codes in my Signal inbox, but it feels like more clutter.

Gmail app buries delete in a couple places in favor of archive. I routinely find I need to open a message to delete it, although the notification has an "archive" quick action button. Gmail made delete extra steps.

I have virtually unlimited space for email, but they still show up in searches, and I'm certain I'll never want to look at them again.