I added Edit 1 to the original post.
Tanks and Helos were gold in previous titles. They were an important asset that if lost could sway the game. Nowadays, with the respawn times so quick and the instant call-ins, they feel devalued.
If a player is using AA, he is not contributing to the ground fight, or paying attention to it. This benefits the other team's ground forces, so even if the helo is not effectively killing anyone, they still are taking the attention away from the other team.
In a recent BT, it felt like I had 4x Lis's and several players with AA and a Wildcat all worried about me flying around in a helo. Most were even in their spawn facing backwards just to try to take me out. It was comical because while my team was easily capping all the points because their ground forces were outnumbered, this group was determined to kill me.
