Artificial Intelligence

All four end-game technologies come at the Library. Artificial Intelligence allows you to produce all units instantly - military and Civilian units pour forth from buildings as soon as you can click the button. For military forces, set the gather point in the middle of a battle, and you can send reinforcements streaming into combat.

Often, your decisions on the order of end-game research technologies will shape the way you pursue combat until all four are done. If you are shy of reinforcements, have many in queue and you are under the population cap with battle approaching, the argument in favor of AI is clear.