Hi.
I think the good thing about AFS4 is that you can easily create flight plans in the simulator, without the need for external applications like Simbrief or Navigraph.
I don't know what AIRAC it uses (maybe in airplanes like A320 it should be in the MCDU).
I recently bought this and I'm blown away... other simulators don't load as fast, or look as good, it's not perfect but I don't need more. This and MSFS are very enjoyable.