I know its probably been done to death, but enlighten me.
 
Why did the writers, producers, studio, whatever decide that between Star Trek TOS and The Motion Picture, that they should have evolved cranial ridges, or skullplates ?
 
Is there a definitive or canon explanation for this, as personally, I preferred the old dusky, gold shiny breasted Klingons, who always had a perfectly coiffured hairdo
 
In later incarnations of Star Trek I actually cringe when the Klingons appear, I just cant get my head round all their warrior psyche, I think its just plain silly.
	
		
			
		
		
	
				
			Why did the writers, producers, studio, whatever decide that between Star Trek TOS and The Motion Picture, that they should have evolved cranial ridges, or skullplates ?
Is there a definitive or canon explanation for this, as personally, I preferred the old dusky, gold shiny breasted Klingons, who always had a perfectly coiffured hairdo

In later incarnations of Star Trek I actually cringe when the Klingons appear, I just cant get my head round all their warrior psyche, I think its just plain silly.
				
 ) So I just don't get the Romulans are honorable thing. 
) but further exaggerating the behavior until they started reminding me of an overdone caricature of General Urko from the old PLANET OF THE APES series from the 1970's. It never made sense to me that a race so immersed in violence, so conflicted from without and from within, could've made it into space without perishing in their own world wars.