On top of the thickness consideration, one difference is that my cabinets have at least 1-1/2" between the top of the cabinet and the drawer and door fronts.  If they had only 1/2" like above, as you said, I think that they would have to put a subtop on just so there was some clearance for the edge overhang.     

--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.