I'm going to try to approach this as level headed as possible.
It is extremely clear to me what weapon type Bungie would like you to use in Iron Banner. Simply look at the Iron Arsenal bounty and you will see that you only accumulate 1 point for a primary kill, 2 points for a secondary kill, and 5 points for a heavy kill.
This bounty tells us something about how Bungie would like PvP to be played. You get double the amount of points for running around with a shotgun, clearly, this is Bungie's preference when running PvP activities.
The reason I make no mention of heavy is because heavy ammo only drops once per match and is typically expended rather quickly.
This is a huge problem in Bungie's thought process. You should not be rewarded for running around with a one hit kill stick the entire match.
The real scoring should be as follows:
Primary = 3 point
Secondary = 1 point
Heavy = 2
Rant = Done
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This problem is not restricted to IB. I think they should change regular crucible as well. 200/250 points for primary kill and 75/100 for secondary. It's also not just shotguns(it is mostly!)but all specials. Some people just refuse to use primaries.