The other vendors gear isn't raid gear nor is pvp gear. PvP gear is pvp gear. Plain and simple. Crucible gear is sold as crucible gear by crucible vendors. Iron banner was a crucible event that had crucible gear. This was all geared for pvp play not pve. The gear is good for pve but better for pvp. Raid gear is best for the raid which is pve, hence why you can only get it in the raid.