This goes for all classes really. If I want a black and and a crossbow or 2 crossbows with different ammp that should be an option.
Why stop there? Why can't i equip 2 primaries instead. An AR and a separate shotgun for close encounters? or ditch my launcher for an SMG? Ok it would be pretty OP, but whilst i see little point in equipping just 2 pistols i suppose it would be nice to have the option there i guess.
Well the 2 examples I gave are the only 2 cases where I can see it being desirable. And even there it would D send on the player.