Why widespread warship sales would wreck the treaty system

How would extensive postwar sales of capital ships affect the Washington treaty system?

They would spread major firepower among additional navies and make a workable treaty far harder, likely requiring many more states to participate.

The proposed sales would have to occur before the Washington treaty took effect, because the treaty restricted onward sales. Dispersing British, American, and German capital ships among additional navies would make arms limitation much harder to negotiate. Japan would face stronger regional fleets, while the United States would have to account for increased South American naval power. A workable agreement would need many more participants, including states outside the historical group of major treaty powers.