This class of guns need to be primaries. They always spawn with ammo, just like primaries, making the need for secondary ammo irrelevant. They will now dominate everything. Goodbye snipers and shotguns and that other weapon type nobody bothers with, we now have constant ammo with our new sidearms.
The whole point of the secondary class is powerful weapons with less ammo, that is now ruined by literally putting primaries in the secondary slot.
So bungie fix this mistake immediately and put secondaries in the primary slot where they belong.
Edit: everybody needs to go look up the definition of burlesque
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You do know what "sidearm" means, right? It means that it's a last resort weapon for when your primary weapon, like an assault rifle or scout rifle, runs out of ammunition and you go to your backup weapon, a sidearm. That's how any solder is outfitted. At least usually, unless they have a special task like blowing off locks and opening doors, in which case they would also have a shotgun or something similar. I know I'm gonna be rocking one of those lovely sidearms in my secondary slot unless I'm doing something important that requires a sniper or shotgun.