I have watched a few pro matchs in youtube. They used cavalry, spearmen, archers but not maa. Is maa useless at pro level?
MAA were used effectively last weekend on the Genesis Tournament Qualifier. (I saw the second game of Tatoh vs Kasva).
Also, I have seen some pro games on Youtube/Twitch were massed MAA with upgrades from HRE can be an instant GG.