'Cause it's the natural way of things. Been that way since '50. I used to think Tele Deluxes looked weird with the Strat headstocks and never gave them much consideration. Now I know they are cool guitars, very cool actually IMO anyway, but I still think they look weird. Someone here on TGP posted a pic of his Deluxe and it had the standard headstock, said it came that way when he bought it. It looks right! You just get used to lookin' at things certain way I guess. I don't like Nashville Teles for that reason, just don't look right with 3 pups.