If it is based on reality, we only need to weaken the damage of javelins. A lot of people don't support this change because there are a lot of factions in the game that don't have bows, and they worry that nerfing the javelin will turn those factions into garbage.
But I would say that we should weaken the role of range units as a whole, and put more emphasis on melee combat, especially the impact of various formations on melee combat, rather than treating them as decorations.