Thank you for proving the point- yet again, this is not reality. This is not a FPS and it doesn't need aspects of that type of game to make it 'better'. If you're looking for 'realistic' bow action, check out all the new bows being used in games like Crysis and Assassin's Creed III.
It's not even an FPS thing, it's just common sense, who fires a crossbow from the right side of their face? It'd add more immersion IMO.