It parses the damage this way. It’s for people who don’t want to use plugins in the game as it doesn’t mess with the game at all. It’s against TOS, but no one cares as long as you don’t talk about it in game. And since a lot of people use this and fewer people use plugins, it’s better supported and will work on launch days most of the time.

There’s also another plugin that does this too for crafting so you know what you have in what inventories, making it quicker to gather and craft stuff.

It’s just easier to capture and parse packets than to put a whole plugin in the game. Plugins are getting better but they do take some time after a patch to get updated to be stable.