Well, Writers StackExchange offers us better/more flexible options for developing our worlds and characters. Is it the fault of badge rushers? To be honest, Worldbuilding expects too much, but offers too little. I don't want to sound like this... However, Writers SE helped me much more than WB.
My experience was the opposite. They won’t run with creative ideas, they just say “sure, write something.” They claim to be about the writing process, not the ideas in a particular story.
If those topics are what you need, than what’s the problem? You could just as well ask why Writers is better than Cooks: the answer is the same. That is the SE that handles your actual questions.