Well AoE2 was really intended for people to just patrol their armies into one another in big slugfests, "micro" is an exploit, crossbowmen were never supposed to win against knights/light cavalry (as shown by the high pierce armor and speed and HP of those units) unless they had an infantry unit to act as a meatshield for them.I feel like the game is too fast if a player cannot efficiently use more than two control groups for their army.
AI armies don't need each unit to be individually microed on paper, you just patrol them in and the similar-style units just fight together and you don't have to worry.