The reduced shots railguns open the interesting possibility of very small beam fighters, even around 100 tons. That doesn't really make them more effective, in fact four would have less firepower than a single 400 ton fighter, but it does give them a sort of survival enhancement in that you can only shoot one at a time. Previously you could do that with very low accuracy gauss, but... then you were using very low accuracy gauss. The only argument against tiny railgun fighters is micromanagement, and that could easily be reduced by improving fighter management tools (and in truth I haven't played with them enough to say if the micromanagement is even still an issue).
Being able to match your capacitor tech will also make for very high DPS weapons, I think. You get the advantages of a high caliber weapon (like improved range and armor penetration) without the cost of low DPS due to capacitor charge being the same regardless of caliber. And that's on top of railguns already getting a bonus to damage per power use and not using corundium.
I honestly think this change might single-handedly make railguns the king of beam weapons, though I look forward to actually playing around with it.