It really takes a bit of time for players to reach proficiency in exploiting the AI (and it's highly individual with a range of some people picking it up incredibly fast, others never doing so). So you will find that what's true for you is not true for everyone.
Personal issue is not what I can or can not do but rather the expected outcome.
The AI is biased. Not towards the player by definition, but towards the player through playstyles, which leads to these ridiculous "AI always targets the player" threads.
Doesn't help that it gets worse the better you get. For the AI, not the player obviously.
Right now humans have between five to ten steps to avoid if they want to declare AND fight the enemy. Most outcomes and decisions lead to the AI - no matter its strength - avoiding combat.
This is not only an issue of threatened but also (or mainly) of priorities.
Leading to any player looking into it being forced to knowingly worsen his situation with _multiple_ decisions.
Being forced to make multiple mistakes on purpose just to get what is perceived as a normal game is not a desired outcome of any change.
On the other hand a normal playstyle leads to AI nations heavily targeting players, again, due to priorities.
And that isn't even counting in rebel behavior, which is just as horrid. I recently sent a massive non-seperatist stack through four OPMs which didn't get sieged down by it, then DoW'ed them (yes, that's a verb now) immediately afterwards. Free cash is nice, I guess.
Inexperienced players get to see the other side of the coin.
Nations in multiple wars sending all their troops against them or, to stay on the rebel example, a 24k stack steamrolling them in 1460.
Every coin has two sides and the current two sides are: Know the framework and conquer a continent without a single engagement or don't know it and have the AI dogpile on you every single time you DoW someone.
If the two choices are boredom and frustration, maybe it's time to give the AI special behavior when interacting with nations controlled by humans.
Because the current focus of improving AI vs AI wars is anti-player.
Not that its behavior would be functional in these wars either.