The Chicago White Sox do not have a long-term option in center field. Perhaps a contact extension for Luis Robert Jr. makes more sense than trading him away.
Getz had a high price for his former All-Star centerfielder, and he was not going to settle for anything less. Contenders were reportedly unwilling to meet Getz's high demand, given Robert Jr's overall struggles at the plate before the All-Star break.
The New York Mets proved to be particularly stingy with their prospects during negotiations, but their 1-8 record since the deadline is likely causing some regret in Queens.