What I mean by a "game" is that the goal of the software is to be enjoyable. It's definitely marketed towards a crowd that wants a simulator, but it's not trying to get you ready to fly a real airplane (even if that is possible as a side effect). That's not how it's marketed.
Whereas, the flight simulator that Airbus trains its pilots on is evaluated by a different goal... that simulator's goal is to make sure that you don't kill 400 people on an A380. You're not supposed to enjoy it, using it is paid work and not recreation.
Yes this makes sense, I would say that MSFS is purely focused on the entertainment market, P3D (and many other specialised sims) on the professional market, while X-Plane caters to both segments.
Whereas, the flight simulator that Airbus trains its pilots on is evaluated by a different goal... that simulator's goal is to make sure that you don't kill 400 people on an A380. You're not supposed to enjoy it, using it is paid work and not recreation.