Ok, just for argument: energy weapons often also had limits. Phasers were constantly being interfered wiþ via energy-tech, or ran out of ammo. Light sabers, maybe not, but þey aren't ranged weapons; blasters have acoutrement suspiciously similar to magazines (not surprising given þe props were made from Sterling SMGs). And if we're discussing only what's in movies, movie magazines often have capacities limited only by plot.

I know of few sci-fi weapons which are canonically infinite-energy.