From the Eldritch Wizardry excerpt on the WotC website:
"This book also represents a new trend in the fine art of Dungeon Mastering. As originally conceived, D&D was limited in scope only by the imagination and devotion of Dungeon Masters everywhere. The supplements have fulfilled the need for fresh ideas and additional stimulation. But somewhere along the line, D&D lost some of its flavor, and began to become predictable. This came about as a result of the proliferation of rule sets; while this was great for us as a company, it was tough on the DM. When all the players had all of the rules in front of them, it became next to impossible to beguile them into danger or mischief."
