If you can manipulate gravity you have a warp drive or at least reactionless drive.
In the story, paragravity only works if it has something to push itself off of. Sort of like an invisible hand pushing against another object. So any vehicle that uses anti-gravity can go only so high off the ground before it craps out. And just about every faction in the story is drop-dead terrified of reactionless drives, so the people who try to build them have a habit of "disappearing."
Electrode erosion? You mean like neutron embrittlement?
Well, in this sense there is embrittlement (and harmful radiation) with easier-to-ignite fusion reactions like D-T & D-D, but then there is a class of Aneutronic fusion reactions, from which D-3He seems to be the best in modded game (assuming that they excavated their 3He, and not counting antimatter, which I fail to see how to sustain economically even in game's "future").
On that line I wonder how hard it would be to ignite D-6Li (which seems absent from game & published mods as of now). Most sources I saw so far just disregard it as being "hard to ignite" (despite big cross-sections) but I wasn't able to find the exact numbers yet.
I also wonder if it would be feasible to ignite fusion with fusion in this case.