I 100% agree.
Using the current / default interface after using DarnUI for over a year with Fallout3 is like going back to Black and White TV.
What actually Hurts is the fact that we can't see the hardcoe mode essentials (hunger, thirst, sleep) on the UI somewhere - I find this particularly "missing".
Save us DarN!
I don't have the game in front of me, but the Pipboy does have bars for hunger, thirst and sleep in a display similar to your rad count. They're pointlessly on separate screens from each other, but you can get to them on the status screen, I believe.
-MD