Ballistic integration is not there to give those ships "more" OP, in fact it's the opposite. To discourage the player from downsizing to mediums and getting more OP to spend on hullmods, they instead get less max OP and discounted larges.
I know...
But the thing about Ballistic Integration is that it could both be and not be a hidden buff meant to encourage spending OP on weapons. It's just that we don't know what the real amount of OP a ship had, whether the ship gains or loses OP. Nonetheless, I assumed like, that it does the former. And that it is just an indirect way of buffing the ship without making it feel like too much of a direct buff and more like an option with drawbacks that forces the player to take secondary considerations into their outlook.
The thing about Conquest is that even though it does have Heavy Ballistic Integration, the default build still uses flak cannons in large slots. Probably cause of the fact that Devastators break the Conquest's behaviour. If it comes to the Onslaught, the amount of PD it has on its sides, and the fact that it has a very small turn rate, and the fact that you can shunt it, and the fact that its shields aren't what you would consider highest quality, still encourages the installation of Devastators. I mean, I guess...
Cyclones on Pegasus used to be good when the mounts converged. Now that Cyclones have less ammo, maybe the mounts should converge again. Cyclone is kind of lame now.
As for Pilums on Pegasus, if you want to spam Pilums, Pegasus can do that by itself (with four Catapults). You do not need a bunch of Vigilance, Condors, and Ventures for that.
Pilum still benefits from ammo increase, its ammo regeneration is slow and the ship can reload itself, so I guess it should be capable of spamming those? It apparently does. Just checked. As in the NPC does that behaviour on its own. These projectiles are technically finite.
There would be a reason not to put Expanded Missile Racks if there was a large version of the Salamander, but like... Why? Why would there be?
This is why ships like Vigilance, Condor don't have built-in EMR, because they can always just equip Salamanders and prioritise secondary aspects. Vigilance with its hybrid mount. Condor with its fighters.
Pegasus does not really have secondary aspects. It's like a Gryphon. It's a missile boat. It should just be a missile boat, I guess... In that it should have EMR, Gryphon used to, but then its system was changed... Oh, wait. It still does. That was just a proposition someone made. So, what's the reason not to give Pegasus missile racks?
Eh, not really important probably. Just a minor thing. I was just kinda thinking about it when calculating Pegasus' stats. And testing it later. Cause it felt to me like it was too predictable for its 50 DP cost.