The problem could have been tackled with greater accuracy using machine learning, but it would have taken a long time for the system to generate enough data points for a sound model and would have required more storage space. This was also complicated by the fact that the model had to be regenerated whenever the physical system being modeled was changed.
The linear programming solution was a lot cheaper and was "close enough" to serve as a useful approximation.
https://en.wikipedia.org/wiki/Operations_research
Basically a mathematical approach to problems of logistics and scheduling developed first in WW2. Very powerful in the domains for which it was developed but less generally applicable than enthusiasts hoped, leading to the usual “hype cycle”.
If you have a problem OR could solve or just want to fool around with it PuLP is very easy to use https://pythonhosted.org/PuLP/ Of course the ease of use means that it is a commodity skill now.
Were you around during the dotcom era?
Although I'm not old enough, I've heard that OR in the 80s was the same crap.