In a pointed post via medium, Firstborn ECD, David Snyder has written an extremely insightful post entitled "Dear Jr Creative…Earn Your Place. You’ll Be Better For It."
Snyder points out in no uncertain terms that a lot of juniors aren't willing to happily put in the grunt work to succeed. They're looking for a short cut despite being completely oblivious to business realities.
This is my favorite passage from the post: