The initial design of the OSRS Gold warriors equipment was to resemble statuettes. But, since the pvp drops back then were so bad that they created the luck drop of ancient warriors equipments so that you could obtain them and make some money (the economy was extremely poor at the time).
Statuettes: These statuettes made available with the brand new bounty hunter system provided hope to those who were looking for great loots. The estimated potential was introduced with the new bounty hunters system, and provided players with a gauge of their chances for good loot. Pvp worlds-Were made to replace the old bounty hunter system, which was a multi-world system, but was reduced to very few worlds.
Hotspots - Areas that offer loot that is 'kinder to players. Clan Wars- One of the very first minigames to allow for F2P. These replaced huge battles in the wilderness between clans. New Bounty Hunter- After many months of pvp, jagex made loot kinder and provided a brand new method to play pk.
FFA arenas- Perhaps the most insignificant thing to happen in Runescape. The update came in a package that ended clan wars forever. It decreased the number of people within the arena and made it less interesting. I'm not even going to talk on the dangers of the arena. Help Request was created when we were unable to trade items in order to turn them into different ones. making armor for low levels, air/law/etc rune running.
Capped Trading- Buy Old School RuneScape Gold, but will most likely not be effective if updates are implemented. Gravestones- These were created to stop people trading from their deaths and to allow traders to retrieve items. DA tournaments were created to bring back the staking system. But it fails badly, even with the most recent update. Revenants were designed to replace the pkers. Many complained that they were too powerful. But they are very poor. However, they are too strong in f2p.