Prune Me, Please
In “Integrating CMMI and Agile Development“, Paul E. McMahon asserts that even though they’d like to, many orgs don’t “prune” their fatty, inefficient, and costly processes because:
..it requires a commitment of the time of key people in the organization who really use the processes. Usually these people are just too busy with direct contract work and the priority doesn’t allow this to happen.
One of BD00’s heroes, the Oracle of Omaha, has a different take on it:
There seems to be some perverse human characteristic that likes to make easy things difficult. – Warren Buffet
Of course, both reasons could apply.