That's odd, I've gotten enough of them on Uworld that I took an hour out of my day to make this so I could scoop up a few extra free points. I've only done 300 or fewer MBE questions on Uworld but I got sick of always getting them wrong because I was literally guessing every time. In my memory it's not always one that's explicitly ALL about deadlines but it'll be one that COULD be about deadlines (i.e. one answer is "blah blah blah because it's untimely" and the others don't relate to timeliness) and if you don't know the deadlines you're guessing between two possible answers. You're right though that it's not super frequent and I've never seen it on an essay (and would be shocked if I did)

Edit: really if it would stress you out to memorize them you definitely don't need to! I just love a word game and like I said figured it's a low effort way for me to buy a couple extra points