In today's busy world of frequent deployments, joint assignments, complex reporting chains, and busy supervisors, the responsibility of developing, writing and editing performance reports is being irresponsibly delegated to the ratee. I've heard many justifications and rationales for this practice.
Some people believe the environment is too competitive to do otherwise.
Others believe their supervisors are unable to adequately develop a good officer or enlisted performance report. In the worst cases, it is the standard operating procedure. During my career, I've had to directly confront two supervisors on this issue of fulfilling their responsibility. More frequently I seem to be confronting peers who develop their own reports. Air Force instructions state the raters will not have the ratee write any portion of his or her own report.