Watching them carry out their orders isn't even the major issue since you generally want to see if your command was successful or not. The major issue is having to wait for the AI to go about their turns, at which point I'm already on another monitor browsing the web or watching a stream.
Part of that is that optimization hasn't happened, because the game isn't feature complete, and re-doing optimization repeatedly is a waste of resources. But the AI can't all move at once even once optimized, because you'd lose track of what they did, and their decisions affect your plan.
