I have a solution to both side's bickering.
Whoever thinks planes being shot down by a tank's main gun is gamey, offer up a solution that is:
1) realistic (none of the stupid "tank rounds do no damage to aircraft" bull crap)
2) fair to both sides (its hard to shoot down aircraft with a tank, but tank's are not negatively affected in tank vs tank combat. This means no reduced turret rotation speed, no removal of tank control from the commander's possition, etc)
3) effective
Because honestly, if YOU are making a correct attack-run, you shouldn't be running into a problem with your aircraft losing in a game of chicken with a 75mm HE shell.
Basically, if you get shot down by a tank's main gun, 1) you're being stupid. 2) the shell just had your name on it, and it had nothing to do with 'gameiness'. 3) any combination of the 2