Dragon darts devalue crossbows pretty much entirely. Why would someone use a slower crossbow with a 33% chance of applying an effect which pretty much relies on that effect to hit well and uses expensive ammo and would also be risking that crossbow? Why not just use expensive ammo that can be thrown? It's higher dps and a lot more reliable than a crossbow. You also don't risk jack using them.
Sara sword for example, shitty accuracy, no dmg at all but still the fastest 2 handed weapon we have in game yet it is not used by anyone nor at pvp or pvm.
Is everything okay Ameer?
Saradomin sword's bonuses: Accuracy: +105 Strength: +90 Prayer: +3 Defence: None
Zamorakian spear's bonuses: Accuracy: +150 Strength: +149 Prayer: None Defence: None (Increased accuracy vs large monsters)
Whip + arcane's bonuses: Accuracy: +102 Strength: +89 Prayer: +5 Defence: +59 +70 +47
Whip + dfs's bonuses: Accuracy: +98 Strength: +83 Prayer: None Defence: +59 +70 +47 (Dragonfire protection)
In situations where you do not need the additional def bonus and the monster is not large, the saradomin sword is the most opimal weapon to use. In PvM this would be against monsters like abyssal demons and nechryaels. Most of our high level pvm content consists of large monsters, which is why you see zs and angers used so much instead of ss. In PvP some players may favor higher defenses instead of that slight boost in damage, and 70 attack pures aren't really a thing either. It does see use in PvP, just very little.