In case of third party content I think it's a valid point. X Plane did not have these add-ons when it was released, they came a few years later. So it's not that strange to give MS FS a bit of time to catch up in terms of third party add-ons.

Missing features in the game itself can't be excused that way, but guess what... X Plane still after many years also doesn't have a good enough for training built-in simulation of a GPS.