This is not a gripe complaining about RNG, but a question as to how some, mostly useless, items continue to exist in this game, while others which might have actual utility do not. The way the loot system has been explained to me is that weapons that cannot take advantage of the set bonus will not drop. Such as a set which only procs from a melee damage. Ranged weapons cannot proc this they shouldn't drop. Which is why we don't get an Advancing Yokeda bow. I can live with that; though an AY bow would be useful to a stamina build even if it did not proc the 5th piece bonus as it could take advantage of the 4th piece bonus.
If that is the case, why are there things like Vicious Serpent staves? We know the set:
(2 items) Adds 833 Weapon Critical
(3 items) Gain Minor Slayer at all times, increasing your damage done to Dungeon, Trial, and Arena Monsters by 5%.
(4 items) Adds 833 Weapon Critical
(5 items) Adds 129 Weapon Damage, Reduces the cost of your Stamina Abilities by 8%. When an enemy you have recently damaged dies, you restore 2150 Stamina and gain Major Expedition for 8 seconds, increasing your Movement Speed by 30%.
As I understand, weapon crit and weapon damage have no effect on staves. Just as spell damage/crit has no effect on melee weapons. I've heard this might be changing, but haven't been able to find anything confirming that. Seeing as you can't beat an enemy over the head with your staff, shouldn't "Smart Loot" have removed these useless weapons from the game, as they did with the AY bow?