I don't know whether you ignore what I said on purpose or whether you just don't speak the same English I do...

All you are thinking of are power plants. There is SO MUCH MORE SHIT you can do with stuff. Let's focus on only couple of the branches:

Weaponry: Chemical explosives would be inferior to fission nukes, fusion nukes would be superior to those, antimatter is likely the king of explosives. After that, shooting subatomic particles at someone might as well allow you to kill the crew without killing the equipment, thus gaining you valuable salvage. Then the mor eyou master subspace travel, the better youwill be able to deploy your units, or maybe even perform subspace torpedo strikes for when you indeed DO wont something jsut vaporized. And when you can contorl gravity, you could pretty much do away with anything you don't like - singularities distupt subspace (microsingularity created at convenient time and palce might prevent a keay enemy asset form retreating), it could destroy ships form the inside, ...

Construction also gets simpler - with exotic particles you already create metamaterials, with gravity control your production will skyrocket.

I agree that not everything follows the scale, the power generation for one as you pointed, but take everything into account and this is what I feel like fits this setting the most. Hence why i turn the blind eye to the occasional breaking of it, the artificial gravity or your exotic particle made materials a case in point.