Update 15.1.6970 brought us some new changes and improvements to AI behavior. There aren’t many changes, but I think the developers, as always in global patches, are making a lot of AI changes that are not described in the patch notes. Also, the Dynasties of the East DLC will be released soon, and perhaps something else will be improved 
AI Update
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AI is now more effective in Full Moon game mode.
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AI players will now take more conservative paths towards their enemies’ Wonders.
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AI fishing boats will now attempt to flee or garrison when threatened.
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AI villagers will not go idle anymore if two or more fishing boats go idle.
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AI players will now trade more efficiently on naval maps.
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Fixed a rare issue for AI units oscillating between attacking landmarks and buildings around them.
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AI players will now progress more smoothly when spawned close to enemies.
P.S
I wanted to write a little, but I haven’t been on the forum for a long time and I’ve accumulated quite a bit
I wanted to thank everyone who wrote about bugs and strange AI behavior. Developers have fixed many issues over this long period of time, which I and many other people reported in my thread and other similar threads on the forum. Thanks to us, many players who like to play with AI can enjoy better gameplay and, in principle, get more pleasure from playing with AI, and there are many such players - very many
If you come across any old AI bugs or find new any yourself, please create a thread on the forum or describe and leave information about the bug here with screenshots and a description of the problem, and it’s best to send your bugs here as well https://support.ageofempires.com/hc/en-us/requests/new[spoiler]because through the support service you will receive a 100% response and a guarantee that the bug will be fixed, while on the forum this does not always work, unfortunately 
There are still many problems and errors in the AI’s behavior, and I hope the new DLC won’t bring even more of them :D, but a huge amount of progress has been made from the old release version of the AI ​​to the present.
I would also like to highlight @JakcieChan1178, who does fantastic things with AI using his mod, and without his mod, I think I would have stopped playing the game so often a long time ago