From a frustrated agent. Short sales are an attempt by an owner of a property to sell their property for less than what is currently owed to the lender. In order to successfully complete a short sale, you need the lender on board to accept less than what is owed. Short sales are handled by a different department of the lender. This department may be known as loss mitigation or risk managment (depends on the lender or servicer). Typically, lender does not want to accept less than what is owed and typically the approval process can take a really long time, once an offer is received. Most buyers walk away while waiting on the lender's approval. Typically, the lender would have received more as a short sale than as a foreclosure.
Sometimes, a property isn't offered as a short sale. A borrower misses x number of payments and the lender takes the property back (foreclosure). At this point, a different department of the lender takes over. The object once the property has come back to the lender is too get the "asset" off their books in the quickest amount of time, with minimal carrying costs with the greatest return possible.
Two very different animals and two very different departments of the lender at work. They do not communicate and apparently do not play well with others (joke).