What Could Be The Wisdom Behind Third Person Language In The Quran
This is the stylistics of a literary expression. If you read good literature, you find such literary agencies adopted by the authors. It entails many meaningful implications. In the exegesis of Tadabbur e Quran by Mawlana Islahi and Al Bayan by Ghamidi Saheb this has been discussed at many places.
please see whole series Introduction to Quran