As a regular jet player (just because no one else bothers and they can be useful with the right loadout) I can honestly say there are very few things more annoying than an AA who sits in their own base for the entire round destroying everything. I don't blame the players, though, it's up to DICE to make sure that kind of thing isn't viable and yet here we are... Attack jets can't kill an AA with reactive armour in one run, and you can be sure a player with even one wit about them will shoot the jet down on it's second run, then hop out and repair. Taking out an AA means teamwork (impossible with randoms, very hard even with friends and voice chat, probably only possible with serious clanmates who have drills for that kind of situation), so not only are they lethal when left alone, they're also very distracting when you want to go after them.