I am very sad that in the movie, Killy can only fire his GBE once a day without assistance while in the manga he can beamspam low-level shots as much as he wants. However, it does help with the drama and allow the Electrofishers to do something useful instead of just relying on Killy McBeamSpam redecorating the entire environment within 70km radius while wiping out every Exterminator in sight.
But why not Killy vs Sanakan while Electrofishers battle against Exterminator horde and Cibo-Builder fights Kaiju Safeguard?