Why do you think the time into the game, the score, information about your team and who you're playing wouldn't be included in the models? Teams have tremendous resources to build models with a ton of situational detail in them. And remember, it could be lower than 68% because of other factors, but it could also be higher. More importantly, wouldn't you want those numbers before making the decision?
"Hey coach, the models say we're better off punting here and you can see it's not a close call." "Oh, good to know, I was thinking we have them on their heels, and their MLB is a little dinged up, but yeah, those things aren't nearly enough to overcome THAT big a difference."
Or: "the analytics think you should go for it, but the difference is pretty small." "Okay, but you know what, my guys are slipping all over the place on that field today, we need to change their cleats at halftime, let's not risk it here for such a small potential benefit."