This comes to mind. In my early school years, a bunch of us kids were really close. We did so many things together at school and all summer in our neighborhood. However it is fascinating to me now that we didn't share anything about our Moms, Dads or Grandparents, the people in our background we were closest to. All of that was implicit, there were no need to discuss the daily lives of ones we knew intimately and loved us so much. So with Paul, I'd think. After all Paul studied under Gamaliel and he would have known how to research and share with the world the biographical details of a subject beyond what people just knew from the Gospels, or word of mouth, at least (they must have known more as they all lived closer to the events). What I am getting at is, he just preached what that really mattered for him.
In general I think none of the epistles in the NT discuss biographical details of Jesus, even those scholars generally agree were written post-70 or not by Paul. They’re pretty short and focused on specific points they want to argue.