Eh, why not? The thread has been necroed anyway.
Kinetic Weapons are terrible and Armor is unnecessarily expensive compared to the other two defenses.
Being cheap and fast does not justify it in any way whatsoever. Why?
Kinetic Ships will be shred to pieces by missile ships long before they get close enough to attack and make use of that speed. Tactical engines do not help unless you stack a bunch of them, which just wastes capacity. This is especially true if you are going up against a fleet of well-built carriers whose fighters have a missile specialization. Kinetics never get a chance to fire. Also, armor is much easier to stack compared to kinetic weaponry.
Even worse, as you get closer, the beams are going to kick in, so you are going to be face-tanking 2/3 of a ships total potential firepower, and you still cannot use those kinetics. It is better to just stick to missile and beams, which usually decide a battle well before kinetics kick in. Kinetics are more of an auxiliary anti-fighter weapon, assuming your ship can even survive long enough to get close and use them.
Along the thought of stacking, I would much rather have kinetic modules cost twice as much with twice the attack than stack like 30 of them to get decent kinetic atk numbers. This is more of a quality of life issue because stacking a lot of modules does cause slow downs on weaker machines.