I think people get frustrated so much about the RNG nature of loot because of how the weapons function loot wise. In most other looter shooters a lot of the power of a gun is intrinsic to the item then you might be instead grinding for better stat affixes to min max your damage, crit chance/damgage or elemental procs. But in Destiny the entire drop of an item hinges on the 2 perk traits and if the 2 perks aren't good perks then the gun is effectively worthless unless its a higher level drop. Destiny also forces you to engage with everything that drops unlike other looters that let you just junk or ignore bad items, Destiny instead forces it into your inventory making you have to delete it or clogs up your postmaster possibly pushing out the items you might actually want. Origin traits are also the only noticeable thing that diffirentiates weapons from each other the scout rifle with Subjugation is more noticeably different than the scout rifle with HAKKE Breach Armaments. Bungie could powercreep loot a bit by putting more emphasis on the origin traits giving extra firepower intrinsically to loot so that perk traits aren't the only factor into the power of a weapon but I'm just spitballing.