Sucks that you can't fly military aircraft. Even some real life professional pilots never get the opportunity to fly those, why not put it in a flight sim since this would be the closest people would be to fulfilling a dream like that? I mean yeah, of course take out the weapons and artillery but to be able to fly the actual modern jets? That would be so awesome! I mean imagine flying a plane from WW 2 or flying a Zeppelin or even one of the more modern types of aircraft that can reach all the way to the edge of the atmosphere etc.
, and I know that you have access to this sort of thing in Ace Combat, sure. But that is still just a game, not really a flight simulator.
In my opinion the point of a simulator is to give you access to something you'd never be able to achieve in real life unless you do it professionally. And taking out military vehicles is a conservative way of doing it and a big missed opportunity in our day and age.
My guess would be it's probably because the government/military doesn't want terrorists to get their hands on their military property to learn it, however I do think those days are over. Technology has gotten to a point where things like A.I. and social media is a bigger threat to humanity than actual people misusing military vehicles. Modern day surveillance is way too advanced for methods like that to be employed effectively.