It's been two years. Are we ever going to get the final Avatar: The Last Airbender questions answered?

The problem is, there are always loose ends. And any given loose end is a major problem for someone. The ones that don't bother you, bother someone else. And any given attempt to wrap up loose ends is invariably going to create some new ones, which will bother someone else. You can't really win this game, so it's best to just take the experience as it is. If you really need closure, work out an answer on your own that satisfies you.