Since Greeks are the only civ limited in hero numbers (4), I guess Hero damage multiplier shouldnt affect Titan in order to balance how civs can deal with the monster.
Its hard to see how if you do a Titan against 3 civs, they can ‘easy’ melt him, but a Titan against Greeks… good luck!
In the classic AoM, the way for Greeks to kill a Titan was with the Helepolis. But now they’ve simply removed the Helepolis’s defense against Titan attacks. Any Titan can destroy a Helepolis with just a few hits.