I'm surprised that worked out for him, given what I've heard about Storyboards, which is that they're fine for really trivial UIs but don't scale well at all for any workflow that's even slightly complex. But that was like 2014. Maybe things have changed since then?
Which is good, because some features only work inside storyboards. For example, the Interface Builder component of Xcode cannot lay out a "static" UITableView (one whose content and subviews are set at design time) unless it's inside a storyboard. No idea why.
I used to avoid storyboards as much as possible, but things like that made me decide it's too much trouble to fight The Man, so now I just usually use them like he wants me to.
I think it's fair to say that storyboards have gotten better, but they still suck.
Personally I still very much fall on the side of not using storyboards for non-trivial UI.