But my whole point was by requesting this pilot change frequencies the controller was increasing the pilots work load... I might have missed but not one seems to have explained why it couldn't have been left where he was as everyone could still hear them both... indeed some replies actually make the freq change seem even more unnecessary!
Simple unexpected freq change for 2 pilot airplane operation with autopilot may not be much trouble but what about single pilot R22 driver with no GPS, no autopilot, etc doing their best to avoid infringing one of the (?) 4 nearby zones? Unnecessaru increase in workload??