well i think it comes from an odd worship of planescape torment
Which is funny since planescape had tons of silly stuff in it, i mean one of your companion is a talking skull.

But i think thats hwere it comes from, the idea that writing most be seirous and thought provoking, it reminds me of sci fi writers trying to get out of "the ghetto" by writing different things or going back to mythology like marion zimmer bradly writing mists of avalon (which was shit, i dont care what isaac asimov says, its shit)