Whoa, I'm just going through trying to clear out my over 70 old inbox notifications, and I just noticed. Happy cake day!
But yeah, I just got out of a gaming sesh playing 2v2s with a friend in aoe4. The amount of times I got completely destroyed cos the other guy was microing effectively while I had cavalry just getting stomped on by archers... Not a good time for my army.
They could improve the pathfinding logic, for sure. (In the broader sense of "pathfinding", which includes actual pathfinding, formation logic, and targeting decisions.) Regrouping has been a huge problem in aoe2 for a long time, and in both 2 and 4 I frequently run into situations where my units are attacking what is obviously not the optimal target (e.g. non-siege targeting buildings rather than the nearby units). But most of the time, when I lose, it's not because of that. It's because I'm just worse at that than my opponent is. Good unit control and positioning is one of the critical skills to being good at rts.