When the focus is making groups look good, this always becomes the problem.

A Service Level agreement is between the customer and the organization.  It is the basis by which we tell our customers reasonable expectations of service.   When a customer creates a task, their should be one SLA per promise we make to the customer.

All the drama of group interactions adn assignments in the background has nothing to do with the customer, and thus nothing to do with our SLAs.

SLA's are designed such that failure provides us sources to investigate.  "Why does this SLA fail all the time"?   "Oh look at the assignment count... nobody knows where this goes"

SLAs designed for ensuring group status quo is a recipe for status quo.