What does it mean that Biden has put Kamala Harris in charge of the border crisis?

Here's a collection of articles on the subject.

Do you think choosing her is an effort to give her the opportunity to do something important and prominent so she can burnish her reputation in preparation for taking over the presidency? Or do you think it is more of an effort to hold her back, to saddle her with a huge problem that she's unlikely to handle well, and the idea is to keep her from edging Biden out?