How would you know that? Bungie designed the game, I'm sure they knew that skating was possible before releasing the game. They wanted Titans to be fast because they have to close the gap since they don't have any ranged melees. Hunters use their agility to duck and dodge to close the gap. Warlocks don't need to close the gap as much because they have the melee range but they can use they're own version of skating to do so. Unintentional side affect my ass.