Basically what the tittle says. With Gjallarhorn you can 'cheese' around frustrating boss mechanics that don't work 100% of the time. 11 times in a row the eye spawned no where near us, so that's a 30 second wipe with an 8 minute wait in airlock for supers and ammo to be available again x 11. 88 minutes waiting in an airlock versus 5-6ish minutes playing. And when I leave (because I don't have a Gjallarhorn and I tell my friends 'I'm just stopping you from Beating this') 1.5 hours later they both have 3 etheric light and I have -blam!- all. Like damn! And for all you get good commenters, why don't you try dismantling your Gjallarhorn and having the same amount of fun doing end game content without it. The problem lies in the fact that Bungie are just lazy developers and can't Seem to find the imagination to design a boss fight that can't have its mechanics totally negated by using Gjallarhorn, or thy can't seem to code the mechanics so that they actually work like they're supposed to!