In general I hope the future AOW4 development is focused more on adding options for synergies, thus new playstyles guarantying even more fun options and replay value.
I don't care about any new skins of races or weirder and weirder mounts. Better AI and for instance improving diplomacy would do more for this game than another form.
I would be okay with one dlc that adds 10 new tomes and plenty of options to hero's customization (new faces, clothes, haircuts, facial hair).
I would love the Dark culture reworked with another (sub)culture with a Dark/Chaos start. If there is another undead theme, like vampires, I'd love to see more uses for the Souls economy other than resurrected Skeletons.
I think Triumph's best dlcs have been so far those that were built around the AoW's lore. I'd rather see more elements framed by the AoW lore's history, adding depth and RPG to the game, than everything goes approach.
Frankly I also see more "water stuff" situational and unnecessary.
Asking for 'better AI' is more or less identical to asking for 'better performance'. It's a reasonable request but necessarily would have to come bundled with content, and it is pretty silly to think that the developers don't already know that players would like either of those things.
There is not going to be the Better AI Expansion, for so many reasons. How do you even sell that? How do you even announce it without the announcement sounding like the the game needs to be fixed rather than expanded on? If I'm doing a dev stream to showcase the Better AI Expansion, how do I actually show that work off?
On an organizational level, Triumph also certainly has different teams working on different aspects of the game. What is the art team doing for the Better AI Expansion? What are the gameplay design teams doing? The map design teams? The narrative teams?
So, 'I don't want content, just better AI' misses the point that if you want better AI, it is going to come with an expansion that includes new content. And ergo it makes much more sense to voice your preference for upcoming content rather than just telling the developers something they already know that is constantly echoed over and over again (and frankly that I think would be said over and over again even if we ever got SkyNet level AI because players are so used to complaining about AI now that I think they'd still do it regardless of how capable their SP opponent was).
And even if all of the stars aligned and you created and successfully marketed the Better AI Expansion... IMHO, a bunch of people would actually hate it. Like, the majority of players would not have fun with it. I think there is a lack of appreciation for just how many people play AoW 4 and think the game is already super hard. That cannot tackle the presently implemented hardest AI.
I've been playtesting a single player tabletop game based on X-Wing, and have been reeaaally shocked at how 90~ percent of people approach play. My sense of what 'normal' difficulty is has been inflated by years of consuming speedrun content and considering myself to be a mediocre strategy game player. But no, I'm in an upper echelon - it's just that the higher you go up the skill curve, the steeper the curve gets. Most people can barely eke out a win against a pretty mid level AI opponent, even one that is only implemented in cardboard.
SkyNet level AI would likely cause most people to stop playing the game. Power users would cheer, but those aren't most players.