DS1. I don’t like the direction the setting took with the Defilers and Preservers the Wizards of Athas supplement and the Revised boxed set.
For one there were now wizards with sources of power that were inexhaustible and have no impact on the ecology of Athas. So awesome were these new sources of magical power that it meant the the path of the preserver is completely unjustifiable. Any risk of putting plants and soil at risk is too much risk. So with these new power sources preservers are just hypocritical defiler-lite.
The Revised boxed set introduced lore and continuity issues that resulted in a mini cleansing war on the wizards forums. Probably quite a few of us participated in that.