How might Italian destroyers have changed if Leone's eight 4.7-inch guns and six torpedoes had become the standard?
Short answerThey might have needed beamier and possibly longer hulls, with more forward gunfire giving them a stronger chance against enemy destroyers. This is a tentative design counterfactual.
NotesThe proposed alternative makes Leone's eight 4.7-inch guns and six torpedoes the starting point for later Italian destroyers. Moving more guns forward could have improved their ability to engage while approaching an opponent. The added battery is expected to require a beamier hull, possibly followed by more length to preserve the length-to-beam ratio. Starting gun fights nearer equality could have improved their chances against enemy destroyers. Torpedoes would still matter, but manoeuvrable opponents could try to comb the torpedo spread, although success was not guaranteed. The answer remains a conditional assessment of how a different armament standard might have changed design and combat.