Same reason, too.
Point 6: Don’t worry about your unread messages. If a message is important, someone will ask you about it. If it wasn’t, you won’t.
I’ve done this plenty of times. Get back from holiday and I just mark everything as read. If something was important they’ll email again. I’ve told people and they thought I was crazy but it’s never not worked.
Ain’t no way a 2 week old unanswered email is still relevant today.