The executor is mostly a copy and the kinetic blaster is based off the heavy blaster so they’re not doing much more than what pirates have done. The gigacannon is new but it’s not very good which is probably why it hadn’t already been developed by someone else.
"weapon system integrates elements of SUPER ALABASTER technology to harness previously unutilized anti-shield effect"
Can we, you know, utilize something else? Like converging Large mounts on the Onslaught? Like all of them? I mean we have a highly trained specialist class of engineer-technicians after all. So why not? And while we are at it I'd like to have a 500 per shot HE damage ballistic gun for a medium mount, please.
Given that the kinetic blaster has an efficiency of 1.4 when some ballistic kinetics have an efficiency of 0.8 shows how it might have been unutilized because it wasn't really attractive especially when the pulse laser, also a medium energy weapon, has an efficiency of 0.8 which is only slightly worse than the kinetic blaster against shields.
The kinetic blaster does just manage to have the best anti shield efficiency among energy weapons and has pretty good DPS as well, but it's not a huge difference so it is pretty easy to see why no one else really bothered.
We also already know modifications can be made because of the pirates and the pathers, they are worse but it can still be done. It just looks like most don't bother because the old stuff seems to be almost always better and at least almost as good compared to new things. They can't just magic up a 500 per shot HE gun and whatever prevented the original designers from converging large mounts on the Onslaught, probably completely stumps the current special engineers.
I think that you have missed the point entirely. "Previously unutilized" means that no domain era blueprints exists. However, Diktat is getting them in numbers. Meaning that it is possible to manufacture something new in large quantities without having domain era blueprints. Even if it is energy weapon.
And now we back to the basics of Starsector balance that is build upon the idea of carefully introduced flaws. Like inability to bring all the guns on a single target. Or using subpar shield generators. Most of the ships are flawed on purpose. And the sole explanation for this is that you can't just build whatever you want and have to deal with the blueprints and all the ideas of the domain era designers no matter how bad they look like from the modern military perspective.
But it just happened that you don't.
You call it magic? I'm ok with that. As long as I get my ships and my guns. Like certain dictator did.