«الأصل في الكلام هو الحقيقة أن تكون بغير واو»
The original or normal form in speech is for the circumstance to occur without wāw.
This principle addresses the usual transitory ḥāl. A circumstance is closely connected to the act or the person whose state it describes, so an additional conjunction is ordinarily unnecessary. “Normal” does not mean “universally mandatory”: a clausal circumstance can take wāw when its form and the required linkage justify it.