For me, Age oF Empires 4 does not make much sense in its current form. I expected it to be a game that would span the period from the outbreak of World War I to the end of XX century, and would allow you to fight tanks, planes (e.g. from the “biplane” era to jet planes), ballistic missiles. It could stop at the times of the 80-90s of the twentieth century to limit the amount of development and the difficulty of creating the game itself (i.e. WW1 era is like Feudal Age) WW2 era is Castle Age cold war era is the new Imperial Age).
Instead, we got the 3D version of Age of Empires 2, which could simply be called AoE2 3D or AoE: Middle Ages.