The one thing an enclosure (Dutch oven, steel bowl) won't do is deliver a massive slam of initial heat, as the steam condenses on the dough.
Ask me how I know: After a few drinks with the neighbors, I got careless and threw in water ungloved. (I usually use ice with the KK to buy time, but I'm using the upper grill for Moroccan bread, leaving me plenty of room to land water on my cast iron skillet and chains.)
The hand in question isn't so bad (I didn't have to skip my pottery wheel class today), but discretion suggests not posting a picture.