I think comparing the realism in this game is the silliest argument.
Melee for bow? I think that would be hilariously awesome. It would lower the chance of a melee to sneak up on an archer and get a quick kill. The archer could defend himself and run away.
Should it be implemented?
no
Archer is good the way it is without everyone being a dedicated archer and being able to fight. Want to defend yourself? be a hybrid or bring a melee weapon.