If the A.I. Romans know that eventually they will have to fight other Roman factions {which human players know will happen} then perhaps they are merely too worried the civil war will happen whilst they're armies are abroad and lose their home territories . I have noticed that the A.I. is far more careful about the safety of its' capital and main cities {and noticed it actually does shift its' designated capital when it seems advantagous} than it was in MTW {remember how you knew the Byzantines would lose Constantinople early no matter how buffed it was and be crippled there after ?!} .
I am pleased C/A fixed this for the A.I. .
Note , in real life , some nations let opportunities go by and miss the chances to prosper , so it isn't much worry for me . What does bug me is the speed of expansion , I think I'll try doubling the time require to bild troops and see if that slows things down : I like to have a nice long game , not a race to see who can become invincable the first .
I miss Glorius Achievments