IMO the endgame laser is a more balanced railgun. So long as it has 50% ammo. it'll have less shots, no explosion radius, the aim assist is less, the RRR is less at hipfire, the charge times are very nearly the same, and it behaves similarly to the Binary in that you have to keep the majority of the laser on them to get the kill. At the time, I think it was hard for people to look past the 'req/warzone' part of the weapon.