Thanks everyone for the reply.
i still think that its bullshit that arrows dont kill phalanx units as someone said the shields and way more smaller than the heavy infantry melee-melee units
anyway as its been said arround there, its about historical accuracy. yet in my opinion the early era archers ( early of the games) compared to the late ones are like the same vs armored units. so in dunno 200 years? they didint upgraded the bows? ( romans )