Larger destroyers under treaty limits

What if London Naval Treaty destroyer tonnage allowed 2,500-ton destroyers?

The answer expects larger destroyers and leaders, more dual-purpose guns and torpedo investment, and pressure on small light cruisers whose advantage would shrink.

A 2,500-ton destroyer limit would probably lift destroyer leaders into the 3,100-3,200-ton range. That produces larger, better-armed destroyers with dual-purpose guns, more torpedoes, and potentially torpedo autoloaders. The main loser would be the small light cruiser, because a cruiser only slightly larger than these destroyers would struggle to justify its extra cost and material.