Okay sure then :
Archers get reduced arrow speed everytime they shoot due to fatigue, after twenty arrows the drawing speed is reduced by 50%.
Mail armor with padded jacks users are immune to arrows. (body, not face)
Tincans are completely immune to arrows except weakspots like under armpits/ eye slits on helmet.
You sure you wanna get into realism?
I said logic, not realism. Situation, where stronger person is actually weaker (he cant stay still with his bow) is not logical. Bow being able to pierce through plate is logical, but unrealistic, so it's not as bad as mentioned by Me situation.
Also, if you'd want to have realism on this level, then running, jumping, slashing should make you tired over time, cheap horses should have own AI and NEVER charge at a soldier. Also, horseman should fall off his horse even, if he's no dead yet. I could count further, but our matter is not about realism, but logic.