My passive electronicly scanned array XASER sez otherwise (central/spinal gun with drone-lenses making final-corrections on beam-path at point-blank, and multiple lens-ports on hull to fire from).Armor is pretty easy to understand. It prevents damage up to a certain extent. Enough force will pierce it. But a million 7.62mm rounds will never pierce tank armor. A single gun with the firepower of a million 7.62mm round will destroy it in one shot. There's a reason people don't shoot AK-47s at tanks, but shoot anti-tank guns at them instead.
I've provided mathematical examples that prove that the amount of weapons mounted on turrets are limited by an inverse-square cube law of surface area, while the size of internally-mounted weapons are limited only by the volume of the ship. When I build my ships to withstand 6 million cubic feet of heavy weapons, an equal-sized ship with nothing but turrets will never, ever be able to damage it with said turrets. Ever.
And people do shoot AKMs at tanks. Hell, the M16 can penetrate more steel-armor at any given range than a 7.62x51mm these days.(M855A2 Green-tip)
But for 5-AU engagements? VLS'd 100-ton anti-capship missiles.