Makes sense , its fun to play team tennis. Laver Cup is basically Davis Cup but high end. You can let down your team , but that is not as depressing as letting down yourself. Also on the flip side, winning for your team is often better than winning for yourself.
You lose against Mannarino in round one of the US Open, terrible. You and Taylor Fritz or Luca Dadari win a high octane doubles match? Peak experience.