Lizard said:It's an interative process, of course. One the story is in motion, narrative law predominates. But the setup and worldbuilding is my favorite part of DMing.
Gah - I hate setup (and to a lesser extent worldbuilding). I'd rather buy a world and make it my own than start from scratch. And I don't have time to make sure that each of my challenges for the PCs are correctly crafted if I have to depart from the presupplied challenges. Give me the math, make sure it works in the majority of cases, and explain what cahnges are critical, and what changes are less so. That seems to be the design philosophy for 4E; so I'm buying it.