Once a noun is established, an ordinary pronoun might be sufficient. Yet a speaker may return to an explicit noun (iẓhār) for emphasis, clarity, or the qualities associated with the named referent.
«فَإِذَا عَزَمْتَ فَتَوَكَّلْ عَلَى اللَّهِ»
When you have resolved upon a course, put your trust in Allah. (Qurʾān 3:159)
The explicit divine name foregrounds the one in whom trust is placed. Its associations with sovereignty, knowledge, and power can make the imperative more compelling than an unelaborated reference.
The analytical task is not to prefer nouns over pronouns in general but to explain why an explicit name has been selected where pronominal reference might otherwise be expected.