It's more about customisation for the players. Everything is done through Lua scripts so players can make their own medals/achievements/whatever they can come up with and distribute them to other players to use. The bad news is that it makes stat tracking tricky to the point where it's probably not worth trying to add it as a feature tied to Optic*. The good news is that you should be able to continue using Sehe's Optic, pending update, if you wish.
Some Halo 3/Reach/4 examples scripted entirely (including animation) through the Lua API. 56k beware:
*it's not actually Optic. It's a completely brand new system from the ground up. It's just the players know what Optic is so the name has been adopted
for maximum confusion.
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