Because bungie realized that our vault at the tower was destroyed, the one at the temple wasn't. They didn't want us to go there and get our celery and ascendant raisins... and our other weapons and gear.... our strange coins... weapons parts... and crux of crota. By the way, wonder what Xur think about us using legendary shards instead of strange coins? I bet he's pretty pissed off now that those strange coins are now useless.