BTW exactly with those pictures (xbow - what are showed above)
will be not very hard to accurate aim. Just look at the picture
You don't need to stick any sh*t on your monitor - just aim a little higher and to the right from the end of the bolt.
So - we can say what Xbow will still have a "ironsight". Not so good as before - but still usable.
But let's look at the bows picture:
First of all - aiming (related to "ironsight") is much harder - here is not specific details or marks on bow body or
part for arrow or bow near from the "real crosshair").
Secondly - humans (as a many other live creatures on the Earth) have a "Binocular vision".
That mean many cool thing - but for this case is needed only one - when you (in RealLife - but it's implemented to let it will be as in RL)...
so, when you put your finger near at your eyes and trying to see anything by lef eye - you will not see this object, but you
will see this object
by right eye.