Immortals, in pursuit of the ultimate of the Immortal Dao, generally sever emotional ties and abandon the Seven Emotions and Six Desires. Therefore, for immortals to cultivate the Seven Emotions and Six Desires Technique, it becomes extremely strenuous and unrewarding, especially for those immortals above the Immortal Emperor Realm. Without turning mortal, almost none can comprehend those seven levels of realm.
Moreover, even if immortals do turn mortal, wanting to comprehend two of the seven levels of realm as quickly as Wang Xiaoqiang did is simply impossible.
