I don't think you realize the toll 20-35 minutes of NBA basketball takes on the body.
Do you really think it's easy to play a highly athletic, compe ive game, then immediately turn around, commute to the airport, take a 4-5 hour flight across timezones, land at 3:30AM, probably get to your hotel and actually in bed around 4:30AM, then try to completely rest your body for another shootaround and game the next day?
Sure, it's not really an excuse because all teams have to deal with it through the season. But pretending like it shouldn't have any effect on the players is just silly.