I dont buy any of the arguments that simply adding a droid would make the X wing tougher, or somehow grant it the barrel roll action (how does a droid do either of these things?). Droids can add tricks of versatility and can improve the basics of an fighter - as they do in the canon - assisting with systems, power and engine management etc. They dont add capabilities by themselves. Your fighter is manoeuverable enough to barrel roll or it isnt, for example.
It enhances the plasma coils.