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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I might be worried about it... If not for that almost non-existent impact and very small ammo capacity that the sidearm have. There's nothing primary about it, the other special weapons will far outclass it. The sidearm will be mostly for the people who would like to run a primary shotgun/sniper, or the people who would like to switch to a cleanup weapon when their primary runs out of ammo. Nobody will be using them to dominate anything.