Raibert writes his report in the park
Mr. Ishiguro wants things to stay orderly and go according to plan. Free robots would be a major change to the Ecosystems Unlimited plan. He's going to want to maintain control.
What would change Mr. Ishiguro's mind?
An okay from his superiors.
And since our only faster than light communication is the annual starship visit, he'll feel any delay that keeps things the way they are will be the way to go.