Improving the AI at higher difficulties

I play against the AI a lot (actually that's all I play) and I love when AI enemies are frustratingly challenging or when AI allies are helpfully proactive.

Currently I feel that the Indian, Japanese, Chinese, Dutch, Russian, British, Inca AI are really well done. Thanks devs! They are aggressive and put up a good fight, particularly in the early ages. This is not to say that the other civs aren't good, just that I get particularly satisfying battles when I play against these AI.

Currently a few issues with the AI:

1. AI allies are sometimes too passive. Their military is good but it's just sitting there in the base.

2. AI still cannot play maps with water. Two problems of this type: firstly, the AI cannot transport units in maps such as Amazonia or Caribbean. Secondly, on mostly land maps with some water, the AI chooses a naval deck, which really isn't necessary since majority of the fighting will be on land. It overinvests in navy and doesn't build a good enough land military.

3. On higher difficulty 1v1, the AI sometimes tries to FF, notably the Ottomans these days. It is no fun to be able to kill the hardest AI with a simple rush because it's trying to FF.

4. Aztecs don't build enough nobles' huts in a standard 1v1 game. The cards that they send aren't good for rushing either, given that Aztecs have tremendous rush potential.

5. Sometimes the AI starts overcollecting coin and does nothing with it. It doesn't know how to use the market as far as I have seen. So there's the coin, lying unused while the AI base is burning.

6. AI needs to build more military buildings, in general, on the harder difficulties, so that destroying a few military buildings doesn't end the game fast. Ideally they should send some vils away when their base is overrun to try a rebuild a hidden base somewhere else. The AI in AoE2 does this.

7. US AI doesn't know to use its military wagons. It also tried to send an arsenal wagon to build a forward arsenal where I was attacking. So the poor wagon ended up dying.

8. AI doesn't upgrade the hp and attack of villagers/settlers. It should at least try to make its villagers harder to kill. Late game settlers should have at least 202 hp.

Feel free to add more. I hope there are people who enjoy playing against the AI and care about the improvement of the AI in the game, at more advanced difficulties.

Thanks for reading!