Yes. Aim assist slows down the reticle on ranges the scope is meant for. And makes bullets homing missiles at their intended range. And it makes it a bit easier to hit targets beyond intended range. None of those help the graviton lance.

Aim assist is a subjective thing, personally I hate weapons with high A.A. I hate when my guns pull on their own! Next time you use one of those fallen Cannon things on a walker take note of how the shots goes to the target instead of where you aim or when you try and turn around and your slowed substantially, that's essentially what you're doing to the GL and for most that's ok, but for myself....I decide where to shoot and this particular weapon has no drop off and any increase will make this gun effective beyond what you can control with the pulse rifles bloom. So imo it's not actually making it better perse, course pve in my context so... On a side note, sunshot will probably benefit the most I would imagine