How come airlines still lose luggage with everything being computerized and barcoded?

Question

Edit: Thanks for taking the time out to reply. I’m enjoying reading all the different explanations and view points.

In: Other

Answer 1

853 million passengers per year

Even with 5 9s (99.999%) effectiveness you would lose 8500 suitcases per year

Tags come off luggage… Suitcases fall off carts or conveyor belts… Thrown on the wrong cart… tsa flags it for random screening and it misses its flight due to handoff between TSA and airline.