I have posted before about this issue regarding Prime Engrams and Exotic Engrams. Almost every time, these drop armor and not weapons. I had collected 6 prime engrams, and out of those 6, 5 droped armor and only one dropped a weapon. It seems that Exotic engrams can only drop armor. Why is this happening. Why would prime engrams not drop close to a 50/50 ratio of weapons and armor. How about more weapon drops!
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For the Exotic Engrams, only world drop exotic weapons can drop from it and once a specific weapon has dropped it gets removed from the loot table as its fairly pointless allowing them to drop multiple times due to it being pullable from collections. As for prime engrams, if they're weighted evenly across the 8 slots then you have less chance of getting weapons simply due to their being less weapon slots.