Hmm, Optimizing arena play, defining balance, noteworthy effort. One slight problem, you don't get to decide what is balance nor optimized

Those are assumptions based on your style of play, it's possible it's not broken for "most" players.
Ack, for the sake of another opinion, is worthless and shouldn't be relied on to protect a base. If "I" wanted to play against a computer I'd do something offline. Better to rely on the fact that the ack is worthless and get the Human players together and defend.
Just saying, it's all about perspective, and one's definition of balanced or optimized is nothing but an opinion.
I'm all for yanking the auto ack all together and doing nothing but manned ack, I mean, this is a multi player game for a reason.
The best thing about AH compared to other flight sims is quite simply that this Isn't those other games, no need to turn this game into them, that's why many of us are here in the first place.