Why French and Italian cruisers favored twin turrets

Why did French and Italian treaty cruisers use twin rather than triple main-gun turrets?

Twin turrets reduced weight and mechanical complexity, helping designers stay within treaty displacement while avoiding the maintenance burden of triples.

The design problem centres on fitting the required armament and mechanisms within Washington Treaty displacement. Twin turrets are treated as a manageable arrangement with fewer maintenance concerns. French quadruple turrets are described as two paired twins, illustrating another way to mount more guns. The British comparison notes the Nelson battleships before triple mounts appeared in the Town-class cruisers. Battleships have more room for their turret installations, so their choices do not transfer directly to treaty cruisers.