You are both wrong. DL cares about the overcrowding at their lounges because it represents their image and their product and their brand. They want to offer the best product and be able to demand premium dollars for that product. Just as they would never want CSRs or FA or GA to give terrible service, they don't want their lounges too either. They need to differential all aspects of their product ecosystem so that their MOST frequent fliers and their HIGHEST paying customers have and end to end superior experience from the moment they enter the airport to the moment they complete their trip. The system broke down in the last several years and they are thankfully righting the ship. They would rather have fewer people spending more, than more people spending less. That race to the bottom never ends well.