3. T3476 - previously key unit, have been removed from T3 (and from the game). That opened a huge window of oportunities for OH mediums and faction in general. Because one must be an idiot to lose p4 or ostwind only to ATGs on urban maps (most maps). P4 can survive 4 ATG shots - they are invinsible to any midgame unit mix. While the do huge dmg to anything.