Why is <insert my favorite snowball weapon> being nerfed?
Because we screwed up a little when we launched them. After plugging them all into a fancy spreadsheet that spit out their exact raw damage magnitudes per second, when taking into account everything from animations, firing cycles, ranges, AOE potential, and max # of targets, and more, we saw a few discrepancies that deserved a nudge in one direction or another, so that players that preferred using a specific weapon for aesthetic reasons weren't receiving the short end of the stick, mechanically speaking.
None of these changes are drastic. I didn't even really intend for the above notes to be seen by players as you honestly aren't likely to even notice (they were for QA's benefit). Just go have fun. This isn't really going to change anything.
Cryptic - Systems Design