Ai and unreal

So what I have seen it boils down to that most if not all game that have the unreal engine is that’s all unreal is just the engine when it comes to advance AI or npc they have no idea what to do so when newbies like me look for some help online with advance AI it always point to the market so we have to buy the ai asset to use in the game we make google and the forum are no help only thing you find there is zombie or war games help how hard is it to have ai walk around with a gun please I did that in 10 mins so what I see on steam for games there is not a lot that are made with unreal its all done outside of the engine and then its loaded into unreal so sure would be nice if there was some doc or videos that show case that not shoot them up war games or zombie games