Honestly (just a personal opinion here) I think it was because after the Dark Below dropped it wasn't long before people were able to solo bungie's entire end game activity all by their lonesome... And what weapon did most of them use to snipe from a safe distance?? Black hammer... It took down ogres, witches, hallowed Knights, etc with limitless ammo.. Making it that much easier for them to solo.. (Not an easy task props to them for great aim) bungie probably got butthurt all their hard work was completed by one single person at first and then it became so easy for them those people started racing for the fastest time doing it lol for an end game activity that should not happen.. But hey what do I know just a random guy on the Internet