So we can't fight NPCs on Icon? Is there a reason why? Also we can't become level 30s? Is there a reason why? I at least thought this functioned like the test server
ICON is a work-around that allows you to access a number of functions of the Client software since there isn't any server. Codewalker built a framework software that would allow access to the Character Creator functions of the Client, then to the map displays, then he tweaked some code to let your characters move around in the map and a tweak to the move function that lets you think you're using the game's "fly" power. Then he got the NPC's that are permanently on the maps to appear and do their normal passive routines (clearing their throats, shifting stance). Then to create NPC's anywhere, etc.
All this was because that functionality is built into Client. Everything else in the game, like powers, NPC movements, etc was handled by the Server and until a Server emulator exists or the game is restored, those functions will be unavailable.