if the seam is in the middle of nothing
ie not at some other dividing feature
it'd look really yucky - even if they had a perfectly even&minimal panel gap that STAYED perfectly even&minimal throughout the car's lifetime
The need for a grills has long been a drag inducing and efficiency sapping design requirement / constraint which has been beautifully (and not) embraced for decades. The Model S initially embraced this with that grey solid oval for familiarity sake in order to achieve a recognizable yet attractive look. As this familiarity gives way to an era no longer requiring a grille, the respective evolution of styling in general will be interesting and the hood shut line may itself become a defining design feature.