There is a logic to Boresight. In some sci fi universes, heavy weapons structurally embedded in the ship formed a large- for the Traveller big ships, only useful- part of their armament.
You think Omegas are bad? Try a BI-15. One major mount, dead-ahead boresight, and upwards of three thousand other, turret, weapons, all of which had a roughly 1 in 216 chance of doing anything to an armoured warship target.
Just enough to make them necessary, not enough to make them anything except absolutely maddening. Whenever I start grumbling about ACtA, I pull out some of the old MegaTraveller stuff, and think 'Oh, well, it isn't that bad.'
Moving by PL would be equally artificial, but it would at least represent something- bigger ships having better sensors and better command and control, smaller ships depending on their speed, and surviving on the basis of reflexes rather than cool judgement.