Because that is all everyone will use for specials in PvP after the totally unnecessary special ammo nerf.
Bungie is digging their own grave. D2 will be a well-deserved flop if they continue down this road.
Edit: Since a few people seem to think I am whining about this, know that I barely play Crucible and when I do, I use primaries and sidearms. I am simply stating the proven fact that when Bungie nerfs something, something else replaces the nerfed guns as the new meta, and then the community will start complaining about [i]that[/i].
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You can hear the next wave of whining getting ready. Next it will be "Invective is OP now..", "Sidearms everywhere now, nerf em", and the ever popular "....Waaaaaahhhhh......this meta sucks....I can't compete". It's inevitable. Makes no difference to me. I'll adjust to the new meta, just like I did to that last several one's. I'll adopt the new meta weapons and hear the same old garbage from the Whiner Battalion, "...you are using crutch weapons....waaaaaaahhh."