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The other part of that is, of course, that they don’t seem to use the technology (or artificial gravity or the tractor beams for that matter) for anything else. In particular no weapons or defence systems.
The Final Architecture series by Adrian Tchaikovsky uses artificial gravity as the basis for almost all its tech.
Seriously, once the shields are down why aren’t they just dematerializing parts of the enemy ship?
And why bother with fussy warp cores? Just de-materialize random junk and use that energy.