It's all a matter of the challenge one wants. For some they take enjoyment in 67-13 victories and 12 sack games by their defensive end. I can't get into that.
The game has become far too easy when I call the plays and so I take much enjoyment out of the challenge to building a team I can't almost guarantee winning with(which is what most people end up doing once they coach to 60-10 wins haha). It's almost like being a GM more than a coach these days. I even give playcalling rights to my coordinators.
To each their own.