Apparently the reason was to deal with hoarders. The problem is that this does nothing to curb them from having hundreds or thousands of weapon parts. All it does is hurt players that develop gear. TTK introduced year two weaponry with the ability to Infuse yet Bungie bottlenecks development for some strange reason. This is the time for players to discover and explore weapons that work for them. You get one that drops with a roll you like why not build it up and see how it plays? We shouldn't have to make some critical decision about what weapons to build up. That's actually a part of the fun. All Bungie did with this nerf is take a process of discovery that should be fun for the player and turned it into a major slog of hurry up and wait.