"Well, the stuff will already have been identified in the picking stage." Sure, but you take some semi-random object out of the basket and add it to the wrong

"Well, the stuff will already have been identified in the picking stage." Sure, but you take some semi-random object out of the basket and add it to the wrong shelf. Do that a few times and things are going to get much harder. If we're honest, regardless there will be wrong classifications anyway - if it wasn't for laser scanners humans would make more mistakes as well and these are nowhere near human intelligence.