Agreeing with decreasing complexity! Or perceived complexity, anyway.
said, an example from K-12 - using the Lightbox gallery plugin.
Normally, photos can only be added by a teacher. If the teacher gives
two students teacher rights to one instance of that activity, they
become the curators for that collection. So, instead of being careful to
take a picture of every student doing something interesting on the
field trip, the two students are given that responsibility.
But now that I read what I wrote - I’m not sure I’m addressing the original post. You can do what I describe with the “Assign roles” item in an activity’s edit menu.