A lot of things aren't simulated in the G1000NXI.
Flight envelope protections, for example, are non‑existent. I'm not sure if that kind of functionality could be added by BS as part of a possible customization. Does WT make the code readily available for customization? Adding custom waypoints is another example that's not present in the sim's default G1000NXI either.
I think that if the G1000NXI were fully functional since BS is a developer with a very high level of realism then it would definitely be worth it. But if it's just to have what we already know, I probably wouldn't pay for it. Especially because I much prefer analog panels anyway.
Alan / From Brazil