I feel like in a very sentry meta it would not break the game (not that it broke the game before imo). Spam is spam and lack of ammo has never stopped me from spamming so I don't understand that argument either :/
Keep in mind that stuff like iron bomber and the winger and hecking battalion backup is allowed but no dice on the mangler why?
EDIT: It seems like main point against the cowmangler is that the right-klick charge shot is considered too low risk/high reward mechanic that it toxic to the game and should be banned.
+ the no ammo benefit seems like too much for people.
+ some people don't like the esthetics
IMO, those are valid reasons but I guess not significant enough to actually ban the weapon. I think I don't mind how the game would be affected if it was allowed. I could be wrong, just haven't been convinced yet at this point. But who cares what I think. Therefore I am going to drop the case.