Why - because bungie brought it up in the dev notes over a month ago with no update or fix to this date. Nerfing and Buffing of 2 COMPLETE weapon types across the board is not a little change. Bungie keeps announcing new changes coming to other aspects of the game but have not addressed this one that is already supposed to be in progress/done. The OP could have probably lived with at least an update in the dev notes or weekly update (ex. "bad juju/ thorn update in progress").