To the guys at OEM, that looks damn good!
I think if they were to fill those slim gaps above the headlights it would add a lot to production costs (as that is a rather fine detail) as well as shipping (a much larger box would be needed with a lot more padding) and it would make the piece more fragile (greater risk of damage during shipping).
If the end user could get a plastic welder (or glue), some scrap plastic, razors, and some sand paper you could definitely fix that gap on your own without too much hassle.