I agree that if the AI actually gave us a reason to build anti air it would make the modern era much more interesting. I actually find a use for sea units on many/most maps but every unit that is AA is just a waste of time. I would be intrigued to see if the AI can actually make good use of bombers - obviously with enough of them it can't lose, but with a reasonable mix it would make things much better on the clogging front. One other thing that I don't know if Thal has addressed is artillery. The upgrade from cannons to artillery is absolutely ludicrous and I find they totally change the game. If I see a mess of infantry or cannons I am fine attacking into it but as soon as I see the AI is full of artillery I suddenly have no interest in attacking whatsoever - the losses are bound to be severe. I think artillery are simply too powerful and too defining in their era. Either a loss of their 3rd point of range or indirect fire would be fine I think, but having both is just brutal to deal with. I don't find the same thing with rocket artillery because by then I have tanks/modern armor to rush them or planes to fly over them.