Who benefits from larger treaty destroyers

Would a 2,000-to-3,000-ton destroyer environment favor the United States more than Britain?

Not initially; Britain could exploit the allowance sooner, while US construction remained constrained by appropriations until the approach of war.

The United States would appreciate more design freedom but still face a Congress reluctant to fund large peacetime programs. Japan would use the allowance to press more capability into each hull. Britain would continue its existing construction rhythm and enlarge designs it was already prepared to order. The higher limit therefore benefits Britain most in the near term, while the United States only realizes the full advantage once war becomes imminent and treaty observance is fading.