Solo vs computers

I've played a number of games now. I'm not a good player and never enven tried the "hard AI"
The one thing I think of is : AI don't seem to use Diplomacy between them as they do with human players.
Every time I played, AI seemed to be allied vs the solo human player. Or at worst AI seem to ignore each other.

Two things, at my point of view, must be changed :
- Once the "peace treaty" stage is reached with an AI, diplo missions should disapear or at least reduce frequency very significantly. At now I don't even bother trying to obtain a diplo agreement with an AI because I know 50% of missions are not sustainable, at least in early times. With "stable" peace or non agression agreements available, diplo could regain some interrest.

-AI should go to war with each other. Of course, they might be fighting here or there but I'm nearly sure they don't attack each other as hard as they fight the solo human player. This should change.

OK guys, I know this has been talked about many times on several threads : AI ganging, Diplo useless in solo games, and so...

But I wished to post a new thread for this suggestion to be clearly visible : LOCK OR SLOW DOWN MISSIONS ONCE AN AGREEMENT IS REACHED.