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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But they are called Sidearms. Like a back up weapon..