Something i think teams forget on going for 4th in the red zone is where you end up.
For instance going for 4th and 2 at the 6 yard line means If you make it you get 1st and goal from the 4th at worst... likely 3rd or better.
If you go for 4th and 2 from the 11/12th and run a play just to get the first down... now you get a 4th and goal at the 10/9/8. You take a huge risk for what is much less likely to get you a reward.
I think many OCs often lose site of down and distance when it comes to setting up the things near/in the red zone. You are SO MUCH MORE likely to score inside than outside the 5. It just because so much harder to get each yard. And yet time and again I see DCs not really properly set up their goal line opportunities. They are so hyper focused on getting that next first down they don't think about what comes after. Sometimes on 3rd down you can't avoid it. But when i see a played called to get exactly 2 yards when you need exactly 1.5 to put you first and goal at nearly the 10... I just lose my mind. You are setting yourself up for failure if you start from there.
This is something i notice no one every seems to talk about but in my mind it is so important.