The kills I get when "throwing up a brick" at range with Plan C, (especially) Pocket Infinity, and even 77 Wizard sometimes are absolutely disgusting... true disbelief moment ("I killed him?"). Light of the Abyss can't pull that stuff, but it's completely brilliant at everything else, so it's been a fun change of pace for me.
I think the nerf to spread alone would be just fine- because the further out you go, the more diffuse the spread will be and thus the less damage you'd do. Regardless of the damage of each individual beam, you wouldn't be able to one-shot at long range if only half of the amount of them were connecting compared to how they work right now. It would also have no effect on the fusion rifles that don't have that range to begin with, because you're not hitting people from that far out even with the current spread.
Well, plan C is an exotic, there really isn't anything like it. It needs the same functional range nerf as every other fusion, because powerful as it should be to justify the slot, you can pretty much snipe people with it in its current form.
Funny thing is Pocket Infinity is the considerably better of the two, it's just harder to use. Plan C is the Suros Regime of FRs- not that they needed one, lol