Some airports require check-in times longer than many of their flights. Once again, it's an airport designed in response to human needs and limitations. Nearly all humans seek to enjoy life and life's experiences. Most values are obvious. All things being equal, they always choose quicker service and lower cost.
People remember enjoyable experiences, and plan their travel accordingly.
If they can't choose which airport to use, they can at least choose how to spend time in it. If an airport isn't enjoyable, people try to minimize their contact with it. It's human nature to avoid the uncomfortable. There are many things airports can't do to affect their success, and many things they can do. They can't change their location, the city and region they serve.