I've found on endless difficulty the AI doesn't produce much of anything, including units, playing the necrophages I have a giant city the size of half the map, with dozens of full army stacks of free units all over the place and they have maybe 4 big hero stacks each? One push and they seem to crumble all the way to the capital, the only reason why they are alive is because I've been waiting to see if they can do something, they can't. They can only bully lone larvaes devouring terrain in random locations.

I'd say that's a common problem of 4X games' AIs. They have all the resources in the world on the max difficulty and no idea how to utilise them. They cannot build efficient cities, efficient and adaptable army compositions and make strategic decisions. Which is very sad. That's why I was rooting for a machine learning powered AIs in a different discussion here

welcome to 4x games.

Is that not the whole reason you set the difficulty to endless? Out of 10 or so different selections, to be challenged?
When setting the slider that far into difficulty enhancement, of course they are going to get extra stuff.

Though in my games I've never had the AI do much of anything, outside of Necro I've never seen the AI send more than 4 stacks as an attack and it's generally squads of laughable composition and power that are easily slaughtered.

Play Ashes of Singularity best Ai, the Ai has the same restrictions as a Player. Only the middle and Harder Diffs do light Cheating in ressources. I had my fun

for the people mentioning 4x games I think the big difference here is that in EL2 units don't occupy hexes - I can't slow down the enemy onslaught by making them march through rough terrain, I can't defend a river line or hilltop city, I can't create artificial choke points with my units as a defender's advantage

in this game you can very comfortably get every single unit to join the battle or siege cities, meaning that a larger force is *always* superior, unless there is some tech disadvantage I guess

in makes sense for the civilization games to give deity AI so many units because if you play smart you can make it so that the AI can only use ~50% of it effectively, while also trading blows efficiently by making them fight into forests and over rivers etc etc

in EL2 it doesn't make sense, as not even albert einstein could prevent 3 full AI armies from walking into your territory with a 3:1 numbers advantage - of course the AI doesn't do that which makes it just as cheesy