Pretty much in the late game they don't do anything special, i think adding more ammunition or higher dmg to javelins and archers would make them alot better and nerfing the morale to compensate with that. Javelins should penetrate the armor at least but they can't even with focus fire for 5 min kill 30 people which is absurd. Archers should be there to maybe just weaken the morale and be like kinda supporting but still a little bit increase in dmg would be nice