The most gamey thing about the tanks in here is shooting down a plane with the main gun. I am retired from the Army from an Armored Cavalry unit and I can tell you you could not ever locate a flying aircraft in the main gun sight much less shoot at it. It would be like drilling a hole in the trunk of your car to stick a scoped rifle out of then having some one drive you around while you try to shoot a flying bird. If a tank ever hit a flying plane it was an accident and the crew never knew they hit it or it was a claim made by the Russians.
I haven't gv'd enough to know this for sure, but I think you are right about this and I think the others who have disagreed, however slightly, aren't seeing the whole picture.
The ability for a tank to fire on and hit an incoming aircraft isn't that unbelievable. I think the reason this is so easy in game is because we have the ability to instantly jump from an unimpeded view and back to the main gun again. It would be a nearly impossible task if the gunner, who has no way of locating that a/c, had to take verbal directions to get his optic turned to the incoming aircraft.
Making the odds of such a shot even more remote, I wager a war time tank commander didn't sit in the open in full view of snipers.