I'm not sure why people really say twin was nerfed to the ground. The fight was much more mechanics based then purely DPS check and it still is. Echo only lightened some DPS efforts and with slightly less mob HPs. T5 wasn't really made that much easier. You still die to conflags +fireballs , twisters, divebombs, dreadknights, not much that a slight HP nerf to snakes influences.