They are good. Storyboard references solve a lot of issues that previously existed, and most companies use them due to their simplicity. If you can’t use a storyboard (or Autolayout) that’s a major red flag.
Now with that being said, they are not the end all be all. In my opinion you should still know how to programmatically create view controllers and lay out views. That is something you WILL have to do at some point, even with a primarily storyboard driven app.