The ASDEX system is indeed NOT supposed to be used instead of controller eyes out the window- it is a supplemental system to alert when a hazardous situation is detected. The man has the responsibility, the machine is the backup.
I think there may be limited circumstances during poor weather when controllers may use it to determine where aircraft are and issue clearances, I'm not sure.
RWSL is designed to alert a pilot that the automated system has detected an aircraft and that a runway is not safe to enter or to cross, but it is not used to give permission- again, the automated safety system alerts to a detected problem, but does not guide aircraft or give permission to pilots to perform actions.
None of these systems will catch every possible problem, and I really hope that lack of an alert/warning is not taken as a signal that all is well- that's the job of the controllers eyes, and is the controllers responsibility.
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