ATC is hundreds of functions and dozens of responsibilities like checking that the runway is safe to land. "Clear to land" is not just a turn of phrase, it is a check and verify that an aircraft with hundreds of people is relying on.
Air traffic is not a deterministic system, it is squishy and significantly more complicated because it involves humans, complex mechanical systems, and weather floating on top of a sea of limited resources.
Air traffic is not a deterministic system, it is squishy and significantly more complicated because it involves humans, complex mechanical systems, and weather floating on top of a sea of limited resources.