Why? Because with the lack of real content and any reason to continue to play after reaching max level your self with only grinding for gear with the perks you want. If they allow you to reroll masterworks many people would already have the god roll set ups. It is done to artificially inflate the time people play by forcing them to grind more. Aka get god roll set up but terrible masterwork ow well enjoy grinding again for another month. Also masterwork is a flawed concept by default. It only really impacts PVP and current PVP is a complete mess where gun skill means nothing and it is mainly super , heavy and shotgun spam. However this is bungie. The reason the meta never really changes is bungie dont have a clue about balancing and for some reason take a year to balance one gun when it should take a week. I would rather them spend a year of balancing weapons once a week and have some sort of balance than once every 3 months and still half the guns dont get balance. Nerf good guns leave bad guns as they are. Decrease TTK. Increase Movement Speed. Increase In Air Accuracy. Revert to 4v4 or Redevelop Maps and Spawns. Nerf the Sh¬t out of heavy and revert to D1 style or just no heavy at all Drop damage Resistance of roaming supers down 25% (Titans pretty much cant be killed and you just have to run and thats just boring.)