Why is explicit wāw often preferable with a nominal circumstantial clause?

Wāw with Nominal Circumstantial Clauses: Omission, Inclusion and Disputed Cases

• It reduces the risk of an independent-resumption reading
• A nominal clause automatically works like affirmative imperfect ḥāl
• Wāw deletes the nominal subject
• Wāw makes both clauses equally independent assertions