By definition a “smart bomb” is a
precision guided bomb that falls on it’s target solely with force of gravity.
A 2000 lb MK84 bomb carries 429kg of Tritonal (20% Aluminium 80% TNT) high explosives. Any other munition that can deliver that amount of explosives with precision guidance are either ballistic or large cruise missiles powered by jet engines. And they are in excess of a million dollar mark. With no more than 30 thousand dollars in cost a “smart bomb” like a JDAM is a no brainier.
A KGK OR HGK kit creates a
smart bomb out of a dumb bomb, irrespective of what decade it was built originally.